When Does Pollen Season End in Alabama — and When Should You Clean?
North Alabama's heavy pollen runs roughly February through early June: trees first (cedar, oak, and the yellow pine wave in March–April), then grasses into June. The yellow film on cars and windows is mostly pine. Clean exteriors after the tree pollen settles — late May onward — or the film returns within days.
What is the yellow film on everything each spring?
Pine pollen, mostly. North Alabama's tree pollen season starts as early as February with cedar and juniper, builds through oak and hickory, and peaks with the visible yellow wave of pine in March and April. Pine grains are large and heavy — they're what coats cars, porches, windows, and anything else that holds still. Grass pollens follow through May into early June, finer and less visible but just as clingy on glass.
When is the right time to clean windows and siding?
After the wave, not during it. Wash windows in March and the yellow film is back by the weekend. The smart calendar: book exterior cleaning from mid-May onward, once the pine wave has settled and the grasses are tapering. That clean then holds through the summer. The other high-value slot is late fall — clearing the year's buildup before the holidays, when you actually see your windows from inside all evening.
This is also why our spring calendar is the most competitive of the year. Everyone sees the pollen film at the same time, and the two-to-three-week booking window means the folks who reserved in April get the late-May dates.
Does pollen actually harm windows and siding, or just look bad?
Mostly cosmetic on glass — but pollen is organic matter, and when it mixes with humidity on siding it becomes food for the algae and mildew that do cause real staining. A pollen-coated north wall in a Shoals summer is a growth medium. Rinsing the film off siding removes the food source; on glass, letting pollen sit through summer rains bakes a grimy haze that a quick wipe only smears.
Window screens are the hidden victim: they catch pollen like a filter, then every rain washes it onto your freshly cleaned glass. It's why screens get washed as a standard part of our window jobs.
How do I keep the house presentable during pollen season?
- ●Rinse porches, furniture, and entry glass with a hose weekly during the pine wave — no soap needed, just knock it down
- ●Keep windows closed during peak weeks; screens filter pollen straight into the tracks
- ●Save the full window clean for after mid-May; spot-clean the front door glass in between
- ●Book the post-pollen slot in April — late-May and June dates go first
Questions we hear about this
What months are worst for pollen in north Alabama?
March and April are the visible peak, driven by pine, with oak close behind. Cedar starts as early as February, and grass pollens carry into early June. The yellow film season is roughly eight weeks.
Should I clean windows during pollen season?
Only glass you can't stand to look through — the film returns within days during the peak. The efficient move is one thorough clean after mid-May, which is also when our post-pollen calendar fills fastest.
Does rain wash pollen away?
Partly — rain knocks pollen out of the air and rinses smooth surfaces, but on glass and siding it mostly turns the dry film into a paste that dries as a grimy haze. Post-rain is when windows look worst.
Does pollen cause the green stuff on my siding?
Indirectly. Pollen itself is yellow and washes off, but it feeds the algae and mildew that grow the green-black film — especially on shaded north walls in our humidity. Rinsing pollen off siding removes the food source.