Orchard Grass Allergy Shots: The Early-Season Pollen Trigger
Orchard grass (Dactylis glomerata) is the early-blooming Pooideae grass — it pollinates 2–3 weeks before Timothy in May, making it the species behind symptoms that start before the 'official' grass season. FDA-standardized at 100,000 BAU/mL (g3) and a direct Oralair 5-grass component, it is covered by any standard Pooideae SCIT protocol via >90% Group 1/5 cross-reactivity.
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
Orchard Grassis 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.
Orchard Grass Allergy Immunotherapy: How It Works
Allergy immunotherapy is the only long-term treatment that re-trains the immune system to stop overreacting to orchard grass — rather than just masking symptoms with antihistamines or steroids. By gradually exposing the body to controlled doses of orchard grass 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 orchard grass 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 orchard grass 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 orchard grass 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 orchard grass 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 orchard grass 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 orchard grass allergy with at-home drops, see how Curex sublingual immunotherapy compares below.
What is Orchard Grass?
The biology, taxonomy, and clinical fingerprint of Orchard Grass — the foundation of how SCIT targets it.
Dactylis glomerata — the sole species in genus Dactylis — with its distinctive 'clustered' panicle (glomerata = clustered). One of the principal causes of May–June hay fever in North America.
- Scientific name
- Dactylis glomerata
- Family
- PoaceaeGrass family
- Type
- Cool-season perennial pasture/hay grass pollen
- Native to
- Europe, temperate Asia; naturalized throughout North America
- Allergen proteins
- Dac g 1 (major) — Group 1 beta-expansin homolog, >90% sensitization via cross-reactivity with Phl p 1Dac g 5 (major) — Group 5 ribonuclease-like homolog, Pooideae-specificDac g 3 — Group 3 expansin-likeProfilin (Dac g 12 homolog) — pan-allergen
- Particle size
- 28–35 μm
- Avoidance difficulty
- Very difficult
How Orchard Grass Allergy Presents
Symptoms by body system — useful for distinguishing Orchard Grass sensitivity from overlapping allergies and infections.
Respiratory
- Nasal congestion and profuse rhinorrhea beginning in late April or early May — before other grasses start
- Sneezing triggered by pasture exposure or rural outdoor activities in May
- Asthma exacerbation during early-season orchard grass peaks
- Hay fever symptoms that precede regional NAB station 'official' grass season alerts
- Persistent sinus pressure from prolonged May–June exposure
Ocular
- Eye itching and tearing starting in late April in warmer regions
- Red conjunctiva during mid-May orchard peak
- Eyelid edema after outdoor exposure near pastures or hay fields
- Contact lens intolerance during May grass pollen counts
Dermal
- Hives from direct contact with freshly cut orchard grass hay
- Atopic dermatitis flares during May peak season
- Pruritus at exposed skin sites after pasture walks in spring
- Urticaria triggered by close proximity to flowering orchard grass
Systemic
- Early-season fatigue and malaise — begins 2–3 weeks before the Timothy peak most patients expect
- Sleep disruption from early-May congestion
- OAS (oral tingling) from profilin cross-reactivity with melon, peach, celery, tomato
- Occupational impairment for farmers and groundskeepers during first hay harvest
The patient who says 'my symptoms always start before the official grass season' is often sensitized to orchard grass rather than Timothy. Orchard pollinates 2–3 weeks earlier in late April and May — adjusting the SCIT pre-treatment window by those weeks, and starting build-up in November rather than January, can be the difference between a controlled spring and a miserable one.
When & Where Orchard Grass Peaks
Allergen intensity by month and by state. Useful for timing SCIT start dates and travel planning.
12-Month Intensity
Peak: mid-May across the eastern US — 2–3 weeks before the Timothy peak· Approximately 10 weeks of exposure; earlier than most other Pooideae species
US Exposure Map
25 high-intensity statesExposure intensity by state (text version)
- ME:
- High
- VT:
- High
- NH:
- High
- WA:
- High
- MT:
- Moderate
- ND:
- Low
- MN:
- High
- WI:
- High
- MI:
- High
- NY:
- High
- MA:
- High
- OR:
- High
- ID:
- Moderate
- WY:
- Moderate
- SD:
- Moderate
- IA:
- High
- IL:
- High
- IN:
- High
- OH:
- High
- PA:
- High
- NJ:
- High
- CT:
- High
- RI:
- None
- CA:
- Moderate
- NV:
- Low
- UT:
- Moderate
- CO:
- Moderate
- NE:
- Moderate
- MO:
- High
- KY:
- High
- WV:
- High
- VA:
- High
- MD:
- High
- DE:
- High
- AZ:
- Low
- NM:
- Low
- KS:
- Moderate
- AR:
- Low
- TN:
- High
- NC:
- High
- SC:
- Low
- OK:
- Low
- LA:
- Low
- MS:
- Low
- AL:
- Low
- GA:
- Low
- TX:
- Low
- FL:
- Low
- AK:
- Low
- HI:
- Low
What Orchard Grass Cross-Reacts With
Patients sensitized to one allergen often react to others sharing similar proteins. This map shows the documented molecular overlaps.
Orchard grass shares 76% antigenic similarity with perennial ryegrass (Pham & Baldo 1995) — its closest molecular sibling — and >90% cross-reactivity with Timothy via Dac g 1/5 homologs, making a single Pooideae SCIT vial fully cross-covering.
76% antigenic and 53% IgE-binding similarity — closest molecular sibling (Pham & Baldo 1995)
Dac g 12 profilin cross-reacts with food profilins; OAS symptoms from raw foods only
Grass Pollen–Food Profilin Syndrome
Orchard grass profilin (Dac g 12 homolog) cross-reacts with profilins in raw tomato, melon, peach, celery, and related foods, causing oral tingling or itching that resolves within minutes. These symptoms are heat-labile — cooking or processing inactivates profilins and eliminates the reaction. Systemic reactions are rare (<1–2% of affected patients).
Is SCIT Right for Your Orchard Grass Allergy?
Answer 5 questions to evaluate whether orchard grass SCIT is the right fit for your early-season grass allergy.
Do your grass allergy symptoms start in April or early May — before most people report grass symptoms?
The Orchard Grass SCIT Protocol
Orchard grass SCIT uses FDA-standardized Dactylis glomerata extract (g3) or, equivalently, a Timothy or 5-grass mix vial via Pooideae cross-reactivity. The critical timing difference from other Pooideae: because orchard peaks in May rather than June, build-up should begin in November rather than January.
Your allergist escalates from highly diluted Dactylis extract to maintenance concentration. Because orchard grass pollinates 2–3 weeks before Timothy, the optimal initiation window is November or December — earlier than the January start that suits Timothy-dominant patients. This ensures maintenance is reached before the late April/early May pollen onset. A 30-minute post-injection observation period is required.
Ongoing maintenance injections sustain immune tolerance throughout the year. The AAAAI/ACAAI Practice Parameter (Cox et al. 2011) endorses continuing injections through the season to maintain protection. Your allergist may adjust the dose during peak season if you experience breakthrough reactions.
Per the Calderon Cochrane 2007 meta-analysis, Pooideae class SCIT produces durable improvement that may persist for years after treatment ends. Benefit assessment at year 3 guides whether to continue to year 5 or discontinue.
Extract Concentration Ladder
You progress through each vial during build-up. Concentration increases ~10x per step.
What the Research Shows for Orchard Grass SCIT
Orchard grass SCIT efficacy is supported by the Pooideae class evidence — including the Calderon Cochrane 2007 meta-analysis across 51 grass SCIT trials and the Frew 2006 Timothy RCT — and confirmed by the Practice Parameter's statement of clinical equivalence for FDA-standardized Dactylis extract.
- Symptom-medication score reduction (Pooideae SCIT class)32%Frew et al. 2006, JACI 117:319, N=410 — class-equivalent for orchard via Pooideae cross-reactivity
- Standardized mean difference (symptoms, 51 trials)73%Calderon et al. 2007, Cochrane Database — SMD -0.73; includes Dactylis-containing grass mixes
- TCS reduction (5-grass Oralair SLIT including orchard)28%Stallergenes Greer Oralair pivotal trial — 5-grass mix includes orchard as direct component
No orchard-grass-specific SCIT RCT has been published; efficacy extrapolates from the Pooideae class effect per Calderon 2007 and Cox 2011. The direct inclusion of Dactylis glomerata in Oralair, however, confirms its clinical recognition as a primary sensitizer warranting allergen-specific coverage.
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
Orchard Grass SCIT Side Effects
Orchard grass SCIT shares the safety profile of all FDA-standardized Pooideae extracts. Local reactions are the most common event; systemic reactions are rare with mandatory observation protocols.
Local reactions
4 documented| Reaction | Rate | Severity |
|---|---|---|
Injection site swelling Expected; resolves within 2–4 hours | Rate 30–50% | Mild |
Injection site itching Cold compress and oral antihistamine provide relief | Rate 25–50% | Mild |
Large local reaction (>5 cm) Prompts dose adjustment at next visit; not a reason to discontinue | Rate 5–10% | Moderate |
Delayed local swelling Occurs 4–8 hours post-injection; common during early build-up | Rate 5–15% | Mild |
Systemic reactions
4 documented| Reaction | Rate | Severity |
|---|---|---|
Generalized urticaria Requires immediate epinephrine and antihistamine; prompts dose reduction | Rate 0.1–0.5% per injection | Moderate |
Rhinitis or conjunctivitis flare Self-resolving; temporary antihistamine use appropriate | Rate 0.5–2% | Mild |
Mild asthma exacerbation Assess peak flow before each injection; withhold if FEV1 <70% predicted | Rate 0.1–0.3% | Moderate |
Anaphylaxis 30-minute observation and a prescribed epinephrine auto-injector confirmed on hand at the injection location are the primary safety requirements | Rate <0.001% per injection | Severe |
All SCIT administrations require a mandatory 30-minute post-injection observation period and a prescribed epinephrine auto-injector confirmed on hand at the injection location. Properly administered Pooideae SCIT has an excellent long-term safety record per the AAAAI/ACAAI surveillance surveys (Epstein et al. 2016).
SCIT vs Alternatives for Orchard Grass
Orchard-grass-allergic patients have four evidence-based options. Notably, Oralair directly includes Dactylis glomerata as one of its five grass components — making it the most direct SLIT tablet match for orchard sensitization.
| Criterion | At-Home SCIT (Curex)Best | SLIT (Oralair includes orchard) | Avoidance | Medications |
|---|---|---|---|---|
| Effectiveness | High — Pooideae class effect (Calderon 2007) | Moderate–High (28% TCS reduction) | Low (pasture/roadside exposure unavoidable) | Moderate (symptomatic only) |
| 5-yr cost estimate | $3,500–$15,000 | $3,000–$8,000 | Minimal | $500–$2,000/yr |
| Duration of benefit | 7–12 years | 2–3 years post-treatment | Only while avoiding | Only while taking |
| Convenience | At-home self-injection; same weekly build-up then monthly cadence | Daily at-home tablet | Very difficult outdoors | Daily |
| Safety | Excellent; Virtual Shot Room–supervised first dose + prescribed epi on hand | Very safe; first dose in clinic | Safe | Good long-term |
| Lasting effect after stopping | Yes — durable remission | Partial | No | No |
At-Home SCIT (Curex)Best
SLIT (Oralair includes orchard)
Avoidance
Medications
SCIT delivers the most durable disease modification for orchard grass allergy. Curex now delivers that same subcutaneous immunotherapy as an at-home allergy shot with pricing confirmed in a current program quote: a personalized Pooideae serum compounded under USP <797> and calibrated to the patient's early-season sensitization pattern, with the first injection from each new vial or concentration supervised live in the Virtual Shot Room by trained Curex clinical staff, a prescribed epinephrine auto-injector confirmed on hand, and week-by-week dose escalation overseen by a board-certified allergist — so patients who prefer a home-based approach get the durable modality dosed for when orchard, not just Timothy, peaks in their region.
What Orchard Grass SCIT Actually Costs
Orchard grass (Dactylis glomerata, g3) is FDA-standardized, so SCIT is generally covered under allergy benefits by major commercial insurers when prescribed by a board-certified allergist. Verify prior authorization requirements and whether the plan distinguishes between standardized and non-standardized extract billing. Curex at-home IgE testing identifies specific orchard grass 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 orchard grass 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.
Free quiz · Board-certified allergists · 50,000+ patients treated · HSA/FSA eligible
Orchard Grass SCIT — Frequently Asked
Quick answers to the questions patients ask most before starting treatment.
Weather apps and news reports typically reference Timothy grass pollen counts from regional monitoring stations, and Timothy peaks in June across most of the northeastern US. Orchard grass (Dactylis glomerata) pollinates 2–3 weeks earlier — in late April or early May in many regions — so patients sensitized to orchard experience their worst symptoms before the counts that reach public awareness. A board-certified allergist can confirm orchard grass sensitization via skin test or serum IgE (ImmunoCAP g3) and can adjust your pre-seasonal treatment window and SCIT initiation timing accordingly.
Immunologically, orchard grass and Timothy grass are closely related Pooideae species sharing >90% Group 1 and Group 5 allergen sequence identity. A patient sensitized to one is almost always sensitized to the other via cross-reactivity. The clinical distinction is timing: orchard pollinates 2–3 weeks before Timothy in most regions, meaning the two species create a sequential peak rather than a simultaneous one. For SCIT prescribing, a single Timothy or 5-grass mix vial covers both species via Pooideae class cross-reactivity (Cox 2011). For SLIT, Oralair directly includes Dactylis glomerata as one of five components.
Yes — farmers, groundskeepers, and ranchers who work in pastures and hay fields during the May–June harvest season experience significantly higher orchard grass pollen exposure than suburban patients. Mowing and cutting hay mechanically liberates pollen from attached inflorescences, creating concentrated local pollen clouds that can far exceed regional NAB counts. Occupational-grade exposure is associated with higher rates of sensitization, more severe symptoms, and greater risk of asthma development. Agricultural workers with grass allergy should discuss early SCIT initiation, occupational protective equipment (N95 mask during harvest), and scheduling injection appointments around the busiest farm weeks.
FDA-standardized Dactylis glomerata extract (g3, 100,000 BAU/mL) is available as a standalone vial. In practice, most US allergists prescribe a multi-allergen SCIT vial that includes orchard grass alongside other regional sensitizers — a 6- or 8-grass mix vial might include orchard, Timothy, Kentucky bluegrass, perennial rye, meadow fescue, sweet vernal, and redtop in one preparation. The AAAAI/ACAAI Practice Parameter also states that for highly cross-reactive Pooideae, a single Timothy or 5-grass mix vial covers orchard equivalently — so a separate Dactylis vial is often unnecessary when Timothy is already prescribed.
Anderegg et al. 2021 (PNAS) documented that North American grass pollen seasons have been starting approximately 20 days earlier and lasting 10 days longer since 1990 due to rising temperatures. For orchard grass, which already has the earliest Pooideae phenology, this means it may begin pollinating in early April rather than late April in warmer years — further extending the symptom window. Climate modeling also projects higher total pollen loads. The practical implication for SCIT patients: your build-up schedule may need to start even earlier than historically recommended to ensure you reach maintenance before the advancing pollen season.
Yes — grass pollen SCIT is well-established for children, typically beginning at age 5 and older per AAAAI guidelines. Orchard grass, being an FDA-standardized extract, follows the same pediatric protocols as Timothy SCIT. Early intervention in childhood may reduce the risk of developing new sensitizations and asthma. Both Oralair (ages 10–65) and Grastek (ages 5–65) are FDA-approved SLIT alternatives that directly cover orchard grass via the 5-grass mix (Oralair) or Pooideae cross-reactivity (Grastek). Note: Curex's at-home pilot is currently open to patients age 12 and older; pediatric patients require a trained adult caregiver physically present for every injection. 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 board-certified pediatric allergist should confirm diagnosis and supervise the course.
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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