Guides

Plain-English writing on allergy season — what's in the air, how to read a pollen forecast, what to take, and when to actually see a doctor. New pieces published through the season.

The basics

• When does allergy season start?
  Tree, grass, ragweed, and mold — when each one begins, when it peaks, and when it ends. Plus why "allergy season" is really four overlapping relays, not one continuous stretch.
• Pollen count explained — what the numbers actually mean
  A reading of "high" means different things for trees, grass, and weeds. Here are the real thresholds (grains per cubic meter) and how to interpret a forecast in your daily routine.
• The year-round allergy calendar
  Month by month: what's pollinating, when, where. Useful for planning outdoor events, travel, and prescription refills.

Pollen by type

• Tree pollen: oak, birch, maple, and friends
  Which trees cause the most trouble, how to tell which is getting you, and why oak pollen seems to coat everything yellow for three weeks every April.
• Grass pollen: the May–July grind
  Once tree season ends, grass picks up the baton. Worst offenders by region, why mowed lawns still release pollen, and why symptoms often get worse on breezy afternoons.
• Ragweed: the late-summer finale
  August through first frost. Why ragweed ruins the last good weather of the year for about 20% of Americans, and what (if anything) actually works against it.

Treatment and relief

• Antihistamines compared: Claritin vs Zyrtec vs Allegra vs Flonase
  The differences between the big over-the-counter options — how fast they work, how drowsy they make you, how to pick the right one. Plus why Flonase plays a different role entirely.
• Do HEPA filters actually help?
  Short answer: yes, in one specific scenario. Longer answer covers what a HEPA actually does, where in the house it belongs, and why the room-sized ones with the giant fan blades aren't a gimmick.
• When to see an allergist (and what to expect)
  If OTC medication isn't working, if symptoms are worsening year over year, or if you want to know specifically what you're allergic to — here's what an allergist visit looks like from start to finish.

The bigger picture

• How climate change is extending allergy season
  Pollen seasons are starting earlier and lasting longer than they did thirty years ago — a measurable, published consequence of warming. Here's what the research says, in plain terms.

Regional guides

State-by-state deep dives — when allergy season starts and ends in your part of the country, the dominant pollens, and local specifics — are being added through spring 2026. Bookmark the homepage for now and the regional index will appear here as pieces publish.