The Definitive Guide
Cedar Fever
Everything You Need to Know About Mountain Cedar in Austin
Understanding the Allergen
What is Mountain Cedar?
Mountain cedar (Juniperus ashei), also called Ashe juniper, is an evergreen tree native to the Texas Hill Country. Despite the name "cedar," it's actually a juniper species. Male trees produce enormous quantities of pollen—a single tree can release billions of pollen grains in a season.
The pollen appears as yellowish-brown clouds drifting from the trees, often mistaken for smoke by newcomers. Cedar pollen grains are tiny (20-30 micrometers) and can travel hundreds of miles on the wind.
The Texas Hill Country west of Austin contains one of the densest concentrations of Ashe juniper in the world. When male trees release pollen, Austin—sitting directly downwind—becomes ground zero for cedar allergies.
Quick Facts
Scientific Name
Juniperus ashei
Common Names
Mountain Cedar, Ashe Juniper, Post Cedar
Peak Season
December – February
Pollen Size
20-30 micrometers
Travel Distance
Hundreds of miles on wind
Fig. 1 — Annual Cycle
Cedar Season Timeline
Cedar season peaks in winter when most other allergens are dormant. Cold fronts trigger pollen release, making the days after a front passes particularly severe.
Symptom Reference
Cedar Fever Symptoms
Despite its name, cedar fever rarely causes an actual fever. Symptoms can range from mild irritation to severe, debilitating reactions.
common
Itchy, watery eyes
common
Runny or stuffy nose
common
Sneezing fits
common
Sore throat
moderate
Fatigue & brain fog
moderate
Headaches
moderate
Ear congestion
rare
Mild fever (rare)
Practical Advice
Survival Guide
Stay Indoors
Keep windows closed and use HEPA air filters. Peak pollen hours are early morning.
Medicate Early
Start antihistamines before symptoms begin. Daily nasal sprays work best with consistent use.
Watch the Wind
North winds bring pollen from the Hill Country. Check forecasts and limit exposure on windy days.
Clean Up
Shower and change clothes after being outside. Wash bedding frequently during peak season.
Fact Check
Myths Debunked
Myth
"Local honey cures cedar allergies"
Fact
Honey contains flower pollen collected by bees—not windborne cedar pollen. Cedar is wind-pollinated and bees don't visit cedar trees. While honey has other benefits, it won't help with cedar fever.
Myth
"Only take allergy meds when symptoms get bad"
Fact
Antihistamines and nasal sprays work best when taken consistently, starting BEFORE the season begins. Once your immune system is fully activated, medications are less effective at controlling symptoms.
Evidence-Based Treatments
What Actually Works
OTC antihistamines
Zyrtec, Claritin, Allegra—take daily
Nasal corticosteroids
Flonase, Nasacort—start 2 weeks early
Saline rinses
Neti pot or spray to flush pollen
HEPA air filters
Run in bedroom during season
Shower after outdoors
Wash pollen from hair and skin
Keep windows closed
Especially on windy days
For severe cases: Talk to an allergist about immunotherapy (allergy shots or sublingual drops). It's the only treatment that can provide long-term relief by desensitizing your immune system to cedar pollen.
Common Questions
Frequently Asked Questions
What is cedar fever?
Cedar fever is the common name for the allergic reaction caused by mountain cedar (Ashe juniper) pollen. Despite the name, it doesn't actually cause a fever—the symptoms just feel like having a cold or flu. It's one of the most severe seasonal allergies in Central Texas.
When is cedar season in Austin?
Cedar season typically runs from December through February, with peak levels in late December and January. The season can start as early as November and extend into March depending on weather conditions. Cold fronts often trigger massive pollen releases.
Why is cedar pollen so bad in Austin?
The Texas Hill Country west of Austin is covered with millions of Ashe juniper trees. When male trees release pollen, it can travel hundreds of miles on the wind. Austin sits directly downwind of this massive cedar population, making it ground zero for cedar allergies.
What pollen count is considered high for cedar?
Cedar pollen counts are measured in grains per cubic meter. Counts below 15 are low, 15-89 is moderate, 90-1,500 is high, and above 1,500 is very high. During peak season, Austin regularly sees counts exceeding 5,000—sometimes over 20,000.
Can you develop cedar allergies later in life?
Yes. Many people who move to Austin develop cedar allergies after 2-5 years of exposure. Your immune system can become sensitized over time. Conversely, some long-term residents report their symptoms improving after many years.
What's the best treatment for cedar fever?
Over-the-counter antihistamines (Zyrtec, Claritin, Allegra) and nasal sprays (Flonase, Nasacort) are first-line treatments. Start taking them before symptoms begin for best results. For severe cases, consult an allergist about immunotherapy (allergy shots or drops).
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