Yes, there is pollen in winter, though the amount depends heavily on where you live. In warmer climates like the southern United States, certain trees release pollen as early as December and January. In colder northern regions, winter pollen levels drop to near zero, with the main pollen season not starting until March.
Which Plants Pollinate in Winter
The biggest winter pollen producer in North America is the cedar and juniper family. In central Texas, Ashe juniper (commonly called mountain cedar) produces flowers between December and February, releasing massive clouds of pollen in the middle of winter. Waco, Texas, for example, sees its earliest pollen peak in January from this family of trees. The phenomenon is so well known locally that “cedar fever” is a recognized part of winter life in the Texas Hill Country.
In the United Kingdom and much of Europe, two tree species pollinate during winter: hazel and alder. Both start releasing pollen in mid-January and continue through mid-April, typically peaking in February. In unusually mild winters, hazel pollen can appear as early as December. Severe cold delays the peak but doesn’t eliminate it entirely.
Northern vs. Southern Climates
The difference between regions is dramatic. Warmer areas like Texas, Florida, and the Gulf Coast have pollen present in the atmosphere year-round. There is no true pollen-free window. Northern locations like Ontario, Canada, have a main pollen season that runs roughly from March through September, leaving the deep winter months mostly clear.
This pattern holds globally. Mediterranean climates, the southern US, and subtropical regions tend to have overlapping pollination cycles that cover every month of the year. The farther north you go, the more defined the “off season” becomes, and the more likely you are to get genuine relief from December through February.
Why Winter Pollen Seasons Are Getting Longer
Milder winters are allowing plants to start their growth cycles earlier, stretching the overall pollen window by weeks in many areas. Trees that historically waited until late February or March to pollinate are now starting in January or even late December in regions that have seen warming trends. This means people in transitional climates, places that used to be reliably pollen-free in winter, may now encounter low but noticeable pollen levels during months that were previously safe.
Winter Allergies or a Cold
One reason people search this question is that they’re sneezing in January and wondering what’s causing it. Winter pollen allergies are easy to confuse with a cold, but a few differences stand out.
- Itchy, watery eyes are a hallmark of allergies and rarely occur with colds or flu.
- Fever never accompanies allergies. If you have a temperature, it’s an infection.
- Body aches point toward a virus. Allergies don’t cause general soreness.
- Duration is the clearest signal. Colds and flu rarely last beyond two weeks. Allergy symptoms persist as long as you’re exposed to the allergen, which for winter tree pollen can mean weeks or months.
Sneezing is common to both colds and allergies, so it’s not a useful distinguishing symptom on its own. If your symptoms come and go with time spent outdoors, worsen on warm or windy days, and include eye itching, winter pollen is a likely cause.
How High Winter Pollen Counts Can Get
Winter pollen counts are generally lower than the spring and summer peaks from grasses and broadleaf trees, but they can still reach levels that trigger symptoms. Tree pollen is considered “high” at 90 to 1,499 grains per cubic meter of air, and “very high” above 1,500. During peak mountain cedar season in central Texas, counts regularly hit the high range. In milder winter-pollinating areas, counts more often stay in the low to moderate range (under 90 grains per cubic meter), which can still bother sensitive individuals.
Reducing Winter Pollen Exposure
If you live in an area with winter pollen, the same strategies that work in spring apply. Keep windows closed on warmer winter days when pollen disperses most actively. Shower and change clothes after spending time outdoors, since pollen clings to hair and fabric.
For your home’s air filtration, look for HVAC filters rated MERV 11 or MERV 12. Filters at these ratings have earned certification from the Asthma and Allergy Foundation of America, with independent testing showing they remove at least 95% of pollen from air passing through them. Portable HEPA air purifiers in bedrooms can add another layer of protection, especially at night when you’re breathing the same air for hours.
Checking local pollen forecasts is just as useful in winter as in spring. Many areas with winter-pollinating trees have pollen monitoring stations that report daily counts, so you can plan outdoor activities for lower-count days rather than guessing.