Cedar Fever: Why Texas Allergies Spike Every Winter
Cedar fever is what central Texans call their winter allergy to mountain cedar pollen. It peaks from December through February, right when the rest of the country gets a break. It is one of the few allergies bad enough to knock people flat, and it is not a fever at all. Here is what causes it, how to tell it from the flu, and how to get through the season.
What Cedar Fever Actually Is
Cedar fever is an allergic reaction to pollen from the mountain cedar tree, which is really a juniper (Ashe juniper). These trees blanket the Texas Hill Country, and they do something unusual: they pollinate in the dead of winter. From December through February, mature trees release so much pollen that hillsides look like they're smoking when the wind picks up.
The pollen is light and travels far, so you don't have to live near a cedar tree to feel it. Austin, San Antonio, and the Hill Country get hit hardest, but the pollen carries across much of central and south Texas. Cedar is one of the most allergenic trees in North America, and its counts can reach staggering numbers on peak days.
The "fever" part is a misnomer that stuck. The allergic reaction can be intense enough to leave people exhausted and feeling feverish, but cedar allergy itself is not an infection.
Cedar Fever Symptoms
Cedar fever hits harder than most seasonal allergies. Common symptoms include:
- Sneezing in long bursts and a runny, stuffy nose
- Itchy, watery, red eyes
- Fatigue and a run-down, foggy feeling
- Sore or scratchy throat from post-nasal drip
- Partial loss of smell and taste
- A slightly raised body temperature in some people
That last one is where cedar fever earns its name. Heavy allergic inflammation can nudge your temperature up a little, but a real fever (above 101.5 degrees) is not from cedar. A high fever, body aches, and chills point to the flu or another infection instead. If your temperature climbs that high, see a doctor rather than reaching for another antihistamine.
Cedar Fever vs. the Flu
Cedar season lands in the middle of flu season, and the two overlap enough to fool people. Here is how to tell them apart:
| Symptom | Cedar Fever | Flu |
|---|---|---|
| Itchy, watery eyes | Common | Rare |
| High fever | No (mild at most) | Often, 100 to 102 degrees |
| Body aches | No | Common, sometimes severe |
| Duration | Weeks, tracks the pollen | About a week |
| Responds to antihistamines | Yes | No |
The simplest tell: if your symptoms rise and fall with the cedar count and ease when you take an antihistamine, it's cedar fever. If you have a real fever and body aches, treat it as an illness and check with a doctor.
When Cedar Fever Peaks
Mountain cedar pollinates from December through February, and January is usually the worst month. The pattern has a quirk worth knowing: cold fronts set it off. A sharp drop in temperature followed by dry, windy, sunny weather triggers the heaviest pollen release, so the roughest cedar days often come right after a cold front rolls through.
That makes cedar fever hard to predict on the calendar alone. Two mild weeks can give way to a brutal three days when the weather turns. Watching your local cedar count is the only way to see the spikes coming. Cedar is the reason central Texas has almost no allergy off-season. As soon as cedar fades in late February, oak and other spring tree pollen pick up.
How to Get Through Cedar Season
You can't dodge cedar pollen in central Texas, but you can blunt it. The key is starting before the season, not after symptoms hit.
Start medication in late November
Begin a daily antihistamine like cetirizine (Zyrtec) or loratadine (Claritin) a couple of weeks before cedar ramps up. Add a steroid nasal spray like fluticasone (Flonase) for congestion. Both work better as prevention than as rescue, so early is the whole game.
Rinse the pollen out
A saline nasal rinse clears pollen from your nose and eases congestion without medication. Use distilled or boiled-then-cooled water, and rinse after you've been outside on high-count days.
Keep cedar out of the house
- Keep windows closed on High and Very High cedar days
- Change clothes and shower after being outdoors
- Run a HEPA air purifier in your bedroom
- Set your car and home air to recirculate on peak days
Consider allergy shots for the long haul
If cedar wrecks every January and medication isn't enough, allergy shots can lower your cedar reaction over a few years. Many central Texans start the process in spring so they're ready by the next winter. You can find an allergist in Texas to talk it through.
Check Cedar Levels in Your City
Cedar counts spike fast and swing city to city, especially after a cold front. The only way to know what today looks like is your local report. Here are the Texas cities cedar hits hardest:
See the Texas pollen calendar, browse all cities, or search by ZIP code to find your local report.
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