Cedar Elm Allergy Shots: Texas's Only Fall Tree Pollen Allergen
Cedar elm (Ulmus crassifolia) is the only major US tree with a true fall pollen season — September through November, peaking in late September — and is the dominant fall tree-pollen allergen across north Texas, Oklahoma, and Louisiana. Patients in DFW, San Antonio, and Austin frequently have this species misdiagnosed as ragweed.
About Curex’s SCIT program
Curex’s at-home allergy shots (SCIT) are coming soon and focus on the most common environmental allergens:
- • Pollens — tree, grass, weed & ragweed
- • Pet dander — cat & dog
- • Dust mites
- • Molds — Alternaria & mold mix
Cedar Elmis covered here for general education and may not be part of Curex’s current treatment set. Join the waitlist and our care team will help confirm your options.
Cedar Elm Allergy Immunotherapy: How It Works
Allergy immunotherapy is the only long-term treatment that re-trains the immune system to stop overreacting to cedar elm — rather than just masking symptoms with antihistamines or steroids. By gradually exposing the body to controlled doses of cedar elm allergen, immunotherapy shifts the underlying allergic response and produces relief that often outlasts treatment by 7–10 years.
There are two evidence-based forms of cedar elm immunotherapy used today, both built on the same desensitization principle but delivered very differently.
of sustained relief after a complete immunotherapy course — the only allergy treatment with proven long-term effect after stopping.
Allergy Shots (SCIT)
Weekly injections of cedar elm extract in a clinic, escalating over 3–6 months until a maintenance dose is reached. Continued monthly for 3–5 years. Longest clinical track record for cedar elm allergy.
- Strongest evidence base for severe and polysensitized patients
- Covered by most insurance plans
- Requires 50–100+ in-person clinic visits across the full course
- Or at home with no clinic visits— Curex’s Virtual Shot Room model delivers the same SCIT program with live video supervision by trained Curex clinical staff for the first injection from each new vial or concentration and restarts after gaps or reactions.
Allergy Drops / Tablets (SLIT)
Daily drops or dissolvable tablets containing cedar elm extract, held under the tongue at home. Same desensitization principle, delivered without injections. WHO-recognized as an effective form of allergy immunotherapy since 2001.
- Taken at home — no weekly clinic trips, no needles
- Lower systemic reaction rate than allergy shots
- Curex offers prescription cedar elm immunotherapy drops with allergist oversight
The rest of this page goes deep on allergen-specific immunotherapy with shots — protocol, efficacy data, side effects, and cost. If you’d rather skip the clinic and treat cedar elm allergy with at-home drops, see how Curex sublingual immunotherapy compares below.
What is Cedar Elm?
The biology, taxonomy, and clinical fingerprint of Cedar Elm — the foundation of how SCIT targets it.
Cedar elm is the only major North American tree that sheds pollen in September–November; its small-leaf corky-bark silhouette is unmistakable along Texas creek beds during fall allergy season.
- Scientific name
- Ulmus crassifolia
- Family
- UlmaceaeElm family
- Type
- Tree pollen — wind-pollinated deciduous; uniquely fall-pollinating major US tree
- Native to
- Texas, Oklahoma, Louisiana, southwest Arkansas
- Allergen proteins
- No formally named IUIS allergen for Ulmus crassifolia as of May 2026
- Particle size
- 23–38 µm equatorial diameter, oblate, stephanoporate (5–6 pores)
- Avoidance difficulty
- Nearly impossible
How Cedar Elm Allergy Presents
Symptoms by body system — useful for distinguishing Cedar Elm sensitivity from overlapping allergies and infections.
Respiratory
- Sneezing attacks and rhinorrhea beginning in late August or September in Texas and Oklahoma
- Nasal congestion persisting through October — outlasting the typical ragweed season
- Post-nasal drip and overnight cough during the fall cedar elm pollen window
- Worsening allergic asthma triggered by the September–November pollen peak
- Symptoms continuing after ragweed season ends without pharmacotherapy improvement
Ocular
- Watery, itchy eyes during fall cedar elm pollen release in Texas and Oklahoma
- Conjunctival injection and periorbital swelling on high-count September days
- Contact lens intolerance during the September–October cedar elm peak
- Eye symptoms that continue well into November, past ragweed season
Dermal
- Atopic dermatitis flares coinciding with the September–November Texas fall pollen window
- Facial flushing during extreme cedar elm pollen days in north Texas
- Contact urticaria from handling cut cedar elm branches (uncommon)
Systemic
- Significant fatigue and cognitive impairment during peak fall cedar elm exposure
- Sleep disruption from severe nasal congestion during the October peak
- Reduced exercise tolerance in patients with cedar-elm-triggered asthma
- Generalized malaise in patients sensitized to cedar elm, ragweed, and fall molds concurrently
- Headache from sustained sinus congestion during the prolonged Texas fall season
In DFW, the patient who tells me their allergies hit hardest in October is overwhelmingly cedar elm, not ragweed. The way to know is to walk outside in September and look for the small-leaf elm with the corky bark — it is pollinating right now, and ragweed counts may already be dropping.
When & Where Cedar Elm Peaks
Allergen intensity by month and by state. Useful for timing SCIT start dates and travel planning.
12-Month Intensity
Peak: late September through mid-October across north Texas and Oklahoma — the only major US tree with this fall window· ~12 weeks of pollen season (August through November); the Texas tri-peak schedule: mountain cedar Dec–Jan, oak Mar–Apr, cedar elm Sep–Oct
US Exposure Map
3 high-intensity statesExposure intensity by state (text version)
- ME:
- Low
- VT:
- Low
- NH:
- Low
- WA:
- Low
- MT:
- Low
- ND:
- Low
- MN:
- Low
- WI:
- Low
- MI:
- Low
- NY:
- Low
- MA:
- Low
- OR:
- Low
- ID:
- Low
- WY:
- Low
- SD:
- Low
- IA:
- Low
- IL:
- Low
- IN:
- Low
- OH:
- Low
- PA:
- Low
- NJ:
- Low
- CT:
- Low
- RI:
- Low
- CA:
- Low
- NV:
- Low
- UT:
- Low
- CO:
- Low
- NE:
- Low
- MO:
- Low
- KY:
- Low
- WV:
- Low
- VA:
- Low
- MD:
- Low
- DE:
- Low
- AZ:
- Low
- NM:
- Low
- KS:
- Low
- AR:
- Moderate
- TN:
- Low
- NC:
- Low
- SC:
- Low
- OK:
- High
- LA:
- High
- MS:
- Low
- AL:
- Low
- GA:
- Low
- TX:
- High
- FL:
- Low
- AK:
- Low
- HI:
- Low
What Cedar Elm Cross-Reacts With
Patients sensitized to one allergen often react to others sharing similar proteins. This map shows the documented molecular overlaps.
Cedar elm cross-reactivity is concentrated within the Ulmaceae family; molecular studies show little cross-reactivity with Fagales, Oleaceae, or Cupressaceae despite the geographic co-occurrence of cedar elm with mountain cedar in Texas.
Cedar elm is often under-represented in standard mixes relative to its Texas dominance
Is SCIT Right for Your Cedar Elm Allergy?
Answer five questions to assess whether cedar elm SCIT fits your fall Texas/Oklahoma rhinitis profile.
How severe are your September–November Texas fall allergy symptoms?
The Cedar Elm SCIT Protocol
Cedar elm SCIT uses a non-standardized extract optimally timed so the build-up phase completes before the August–September Texas pollen onset, ensuring patients reach maintenance dose during the peak exposure window.
Beginning in late winter or spring (February–April), your allergist escalates from the most dilute cedar elm extract concentration to the target maintenance dose over 6–8 months — ideally completing build-up by August to maximize protection during the September–October Texas peak. The 30-minute post-injection observation period is mandatory at every visit.
Ongoing maintenance injections continue year-round on a schedule set by the prescribing allergist, providing ongoing immune desensitization during the annual September–November cedar elm season. Annual symptom diaries help track improvement across successive fall seasons. The 30-minute post-injection observation is required at each maintenance visit.
After completing the recommended course, durable post-treatment benefit is the goal — most non-standardized tree SCIT patients sustain meaningful symptom reduction for years after stopping, based on broader tree SCIT data from the Cox 2011 Practice Parameter.
Extract Concentration Ladder
You progress through each vial during build-up. Concentration increases ~10x per step.
What the Research Shows for Cedar Elm SCIT
No randomized controlled trial has been published specifically for cedar elm SCIT. Evidence is extrapolated from observational data linking Ulmus pollen to respiratory outcomes and the AAAAI/ACAAI Practice Parameter for non-standardized tree immunotherapy.
- Ulmus pollen–asthma hospitalization association55%Dales et al., Int Arch Allergy Immunol 2008;146:241–247 — multi-city Canadian cities study
- Elm sensitization prevalence in US allergic patients25%Hoffman, cited in Ann Allergy Asthma Immunol 2014 Chinese Elm allergen-of-the-month; 371-patient US series
- Texas and Midwest pollen-integral increase 1990–2018 (climate trend)21%Anderegg et al., PNAS 2021;118(7):e2013284118 — North American pollen season analysis
- Estimated benefit from non-standardized tree SCIT (extrapolated)50%Cox L et al., J Allergy Clin Immunol 2011;127:S1–S55 — Practice Parameter Third Update
Cedar elm SCIT has no dedicated efficacy trial despite its substantial regional clinical impact. The Texas aerobiology literature and the documented asthma-hospitalization correlation with Ulmus pollen support its inclusion in Texas/Oklahoma SCIT protocols for patients with confirmed sensitization and inadequate pharmacotherapy response. A board-certified allergist should distinguish cedar elm from concurrent mountain cedar (Dec–Jan) and oak (Mar–Apr) sensitizations when prescribing the full Texas tri-peak treatment plan.
Ready to skip the surprise bills?
At-home allergy shots (SCIT) are designed by board-certified allergists. See the listed SCIT plan rate in our pricing record and request a quote for eligibility, initiation and total care costs.
- MD-ledBoard-certified allergists
- QuoteTotal care estimate
- 50K+Patients treated
- HSA/FSAEligible
Cedar Elm SCIT Side Effects
Cedar elm SCIT side effects follow the pattern for non-standardized inhalant tree extracts; local injection-site reactions are most common, and serious systemic events are rare with proper protocols.
Local reactions
4 documented| Reaction | Rate | Severity |
|---|---|---|
Injection-site erythema and swelling Most common; typically resolves within 4–8 hours | Rate 25–50% | Mild |
Injection-site pruritus Localized itching; cool compress provides relief in most cases | Rate 20–35% | Mild |
Large local reaction Swelling >5 cm; may require dose reduction at next visit | Rate 5–10% | Moderate |
Delayed local soreness Induration 4–8 hours post-injection; usually self-limited | Rate 5–8% | Mild |
Systemic reactions
4 documented| Reaction | Rate | Severity |
|---|---|---|
Rhinitis or conjunctivitis flare Transient symptom exacerbation; more likely during active pollen season injections | Rate 0.5–1% | Mild |
Urticaria Hives beyond injection site; requires clinical evaluation and possible dose adjustment; for at-home Curex patients, dose changes are reviewed by trained Curex clinical staff and the prescribing allergist. | Rate 0.1–0.3% | Moderate |
Mild bronchospasm Higher risk during peak September–October cedar elm season; pre-injection peak-flow check recommended for asthmatics | Rate 0.1–0.2% | Moderate |
Anaphylaxis Extremely rare; a 30-minute self-observation, a prescribed epinephrine auto-injector confirmed on hand, and live Zoom supervision of the first injection from each new vial or concentration is designed to detect it immediately. | Rate <0.01% | Severe |
SCIT has traditionally been administered in a clinic equipped for emergency treatment; for eligible patients, Curex makes safe at-home self-administration possible with a serum sterile-compounded to USP <797>, a prescribed epinephrine auto-injector confirmed on hand, and the first injection from each new vial or concentration supervised live in the Virtual Shot Room. A 30-minute observation follows every dose and is especially important during the September–October Texas pollen peak when systemic reactivity may be heightened.
SCIT vs Alternatives for Cedar Elm
Texas fall allergy management for cedar-elm-sensitized patients can include seasonal pharmacotherapy, avoidance (limited for a dominant native woodland tree), sublingual immunotherapy, or SCIT — now available as a weekly at-home shot with Curex.
| Criterion | SCITBest | SLIT | Avoidance | Medications |
|---|---|---|---|---|
| Effectiveness | Moderate (no RCT) | Comparable (extrapolated) | Very limited outdoors | Good short-term control |
| 5-yr cost | $3,500–$9,000 | Varies by provider | Low | $500–$2,000/yr |
| Duration | 3–5 years | 3–5 years | Ongoing | Lifelong |
| Convenience | Weekly at-home build-up easing to ongoing maintenance with Curex | Daily drops at home | Nearly impossible in TX | Daily pill/spray |
| Safety | Very safe; sterile-compounded serum plus live Zoom supervision of every dose change | Very safe | Excellent | Generally safe |
| Lasting effect | Yes, years post-tx | Yes, years post-tx | No | No — returns off meds |
SCITBest
SLIT
Avoidance
Medications
SCIT is the most effective long-term option for confirmed cedar elm sensitization in Texas and Oklahoma patients with multi-season fall symptoms — and with Curex, eligible patients self-administer that shot at home with pricing confirmed in a current program quote instead of committing to weekly clinic visits, with the first injection from each new vial or concentration supervised live in the Virtual Shot Room and a prescribed epinephrine auto-injector confirmed on hand.
What Cedar Elm SCIT Actually Costs
Major US insurers typically cover cedar elm SCIT under standard allergy benefits when prescribed by a board-certified allergist with documented positive sensitization testing and a fall rhinitis diagnosis; Texas patients managing the tri-peak allergy schedule (mountain cedar, oak, cedar elm) often benefit from discussing multi-allergen coverage with their insurer. Curex at-home IgE testing identifies specific cedar elm sensitization before allergist consultations, eliminating the need for an initial skin-test visit.
Cost range varies by deductible, co-insurance, and clinic.
Verify these codes with your insurer to confirm coverage.
See the listed Environmental Allergy Shots Plan rate, commercial terms dated 2026-10-12; consultations are included without copay. Confirm availability, eligibility, other included services, testing, any in-person care, insurance responsibility and billing cadence in your written quote before enrolling.
Join the waitlistStop guessing about your cedar elm allergy. Get a plan.
Take Curex’s 3-minute allergy quiz. A board-certified allergist will review your symptoms and recommend the right immunotherapy path for you — shots or drops.
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Cedar Elm SCIT — Frequently Asked
Quick answers to the questions patients ask most before starting treatment.
Cedar elm is the dominant reason. Ragweed (Ambrosia) peaks in August and September across most of Texas, then declines significantly by mid-October. Cedar elm (Ulmus crassifolia) sheds pollen from late August through November, peaking in late September and October — after ragweed counts are already dropping. This timing offset means patients who are still symptomatic in October, when antihistamines that controlled their August ragweed symptoms seem to be 'wearing off,' are likely reacting primarily to cedar elm. Texas aerobiology data from the National Allergy Bureau stations in Dallas, Austin, and San Antonio consistently show cedar elm as the dominant fall tree-pollen count from late September onward. A species-specific IgE test to U. crassifolia confirms this sensitization.
Texas has three distinct tree-pollen peaks across the year, each driven by a different species: mountain cedar (Juniperus ashei) from December through February with the world's highest documented tree-pollen counts (20,000–32,000 grains per cubic meter); live oak and other oak species (Quercus) from March through April; and cedar elm (Ulmus crassifolia) from September through November. Most states have a single spring tree-pollen peak; Texas patients face year-round allergic exposure from trees alone. Patients who are sensitized to all three require separate SCIT extracts for each species or a carefully designed multi-allergen vial. A board-certified allergist practicing in Texas will be familiar with this tri-peak schedule.
Cedar elm and mountain cedar are completely unrelated botanically and molecularly — Ulmus crassifolia (Ulmaceae) vs Juniperus ashei (Cupressaceae) — and have non-overlapping pollen seasons: cedar elm peaks September–October while mountain cedar peaks December–February. If your symptoms begin in September and peak in October, cedar elm is the primary suspect. If your worst allergy weeks are December through January — the infamous 'cedar fever' season in central Texas — mountain cedar is the driver. Both can be confirmed by allergen-specific IgE blood tests. Having symptoms in both windows suggests co-sensitization to both species, which is common in central Texas patients and drives the need for separate immunotherapy targets.
For DFW and Austin patients with confirmed cedar elm sensitization and multi-season fall symptoms that are inadequately controlled by antihistamines and nasal steroids, SCIT is a reasonable long-term investment. Cedar elm is the dominant fall tree-pollen allergen in both cities, with airborne counts sufficient to drive asthma hospitalizations (Dales et al., Int Arch Allergy Immunol 2008). While no cedar elm-specific RCT has been published, the AAAAI/ACAAI Practice Parameter supports immunotherapy for documented sensitization with pharmacotherapy failure. The decision should weigh symptom severity against the 3–5 year commitment; for patients managing the full Texas tri-peak schedule, multi-allergen protocols covering cedar elm, mountain cedar, and oak may offer broader seasonal benefit.
Yes — Texas allergists routinely prescribe multi-allergen vials that combine cedar elm, mountain cedar (Juniperus ashei), and oak in a single treatment protocol. Because cedar elm (Ulmaceae) and mountain cedar (Cupressaceae) belong to entirely different plant families with no cross-reactivity, they require separate extract components in the mix. There is no immunologic reason to separate them into different injections; they can coexist in a single vial at appropriate concentrations. The Practice Parameter (Cox 2011) and Greenhawt 2023 update support combining confirmed sensitizations into a pragmatic treatment mix. Your Texas allergist can design a multi-allergen protocol that addresses the full tri-peak schedule.
Most patients notice meaningful improvement in fall cedar elm symptoms after one or two full October seasons on the maintenance dose — typically 12–24 months into treatment. The build-up phase (6–8 months) ideally finishes before the August start of cedar elm season, so some partial benefit may be apparent in the first fall after starting. Full immunologic modulation develops over 2–3 years of consistent treatment. These timelines are extrapolated from the broader non-standardized tree SCIT literature; no cedar-elm-specific efficacy study has been published. Consistency with the injection schedule is the strongest predictor of a favorable outcome.
Yes — Anderegg et al. (PNAS 2021) documented that Texas and the Midwest showed among the largest pollen-integral increases in North America between 1990 and 2018, with fall seasons lengthening and total pollen amounts rising approximately 21% on average. Cedar elm, as the dominant fall tree pollen in north Texas, falls into the category of expanding fall exposure. Patients who feel their October symptoms have worsened over the past decade are likely experiencing a real climate-driven increase in pollen load, not just perception. This makes the case for long-term immunotherapy stronger — progressive sensitization driven by increasing exposure is one of the clearest indications for SCIT consideration.
Yes — cedar elm SCIT is appropriate for pediatric patients in Texas and Oklahoma with confirmed U. crassifolia sensitization and fall symptoms not adequately controlled by antihistamines and nasal steroids. The AAAAI/ACAAI Practice Parameters support allergen immunotherapy in children typically from age 5 onward. Pediatric build-up schedules are adjusted for body weight and skin-test reactivity. The 30-minute post-injection observation period is mandatory and parents should be instructed in early systemic reaction recognition. A large safety study of self-administered allergen immunotherapy (Schaffer et al., 2015) found that across 23,614 patients giving 2,021,600 injections, the systemic reaction rate was just 0.16% per patient with no fatalities — lower than the 3%–14% typically seen with office-based shots. A Texas-based pediatric allergist familiar with the regional tree-pollen schedule is best positioned to design an age-appropriate multi-allergen protocol for the full Texas tri-peak exposure. Note: the Curex at-home pilot is currently open to patients age 12 and older; pediatric patients require a trained adult caregiver physically present for every injection.
This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition. Content reviewed by board-certified allergists at Curex.
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