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When Does Allergy Season Start in Contra Costa County?
In Contra Costa County and the greater East Bay, allergy season can begin as early as late winter and extend well into fall.
Unlike colder regions that experience a true pollen “break,” Northern California’s mild winters allow plants to bloom earlier and for longer periods.
Peak allergy triggers in the East Bay typically include:
- Tree pollen (February–April)
- Grass pollen (April–June)
- Weed pollen (late summer to fall)
- Mold spores after winter rains
Because these seasons overlap, many residents experience symptoms for months at a time.
Why Allergies Feel Worse in the East Bay
Several local factors contribute to more intense allergy symptoms:
Mild Winters
Warmer temperatures allow pollen-producing trees to bloom earlier than in other parts of the country.
Winter Rainfall
Heavy winter rains stimulate plant growth, leading to higher pollen production in spring.
High Pollen-Producing Trees
Oak, olive, walnut, and cypress trees are common in Contra Costa County and produce significant airborne pollen.
Wind Patterns
East Bay wind conditions can spread pollen across neighborhoods quickly, even if you’re not directly near trees or open land.
Agricultural Exposure
As near Brentwood and eastern Contra Costa County include agricultural zones that increase overall pollen exposure.
Common Allergy Symptoms in Contra Costa County
Seasonal allergy symptoms may include:
- Sneezing
- Nasal congestion
- Itchy or watery eyes
- Post-nasal drip
- Sinus pressure
- Fatigue
Unlike colds, allergies typically do not cause fever.
When Should You See a Doctor for Allergies?
While many seasonal allergies can be managed with over-the-counter medications, medical evaluation may be appropriate if:
- Symptoms last longer than 10 days without improvement
- You develop fever
- You experience significant facial pain
- Symptoms interfere with sleep or daily life
Primary care physicians can help determine whether symptoms are due to allergies, sinus infection, or another condition and develop a personalized treatment plan.
How to Prepare for Peak Allergy Season in Contra Costa County
If you experience spring allergies every year, consider:
- Starting nasal steroid sprays early (they may take several days to reach full effect)
- Monitoring local pollen forecasts
- Keeping windows closed on high pollen days
- Showering after outdoor exposure
- Discussing long-term allergy management with your primary care provider
Early intervention is often more effective than waiting until symptoms become severe.
Take Control of Allergy Season in the East Bay
Allergy season in Contra Costa County can last longer and feel more intense than in other parts of the country. Early treatment and the right care plan can make a measurable difference.
If your symptoms return each year, disrupt sleep, or are not improving with over-the-counter treatments, it may be time for a more targeted evaluation.
Primary care providers at BASS Medical Group help patients across Walnut Creek, Brentwood, and the East Bay manage seasonal allergies, identify triggers, and optimize treatment. For patients with persistent sinus issues, chronic congestion, or complications like nasal polyps or recurrent sinus infections, referral to a specialist may be appropriate.
Dr. Jee-Hong (Peter) Kim, MD, a fellowship-trained ENT and rhinology specialist at the California Sinus Center, provides advanced evaluation and treatment for chronic sinus and nasal conditions, including cases that do not respond to standard allergy care.
Early evaluation can help prevent symptoms from worsening and improve long-term control.
Schedule an appointment to review your symptoms and determine the most effective treatment approach.
