Timothy Grass Pollen
GrassesA major hay and pasture grass, widely used in allergy research and immunotherapy. Common across temperate Europe and North America.
In a typical year, Timothy Grass Pollen season runs May to August, peaking around June to July.
Where is Timothy Grass Pollen highest today?
Live ranking across the cities we track, from today's forecast. Updated daily.
| Locations | Level | Count |
|---|---|---|
| Ankara · Turkey | HIGH | 58 grains/m³ |
| Skopje · North Macedonia | HIGH | 55 grains/m³ |
| Des Moines · United States | HIGH | 34 grains/m³ |
| Sarajevo · Bosnia and Herzegovina | HIGH | 29 grains/m³ |
| Kharkiv · Ukraine | HIGH | 28 grains/m³ |
| Bursa · Turkey | HIGH | 26 grains/m³ |
| Omaha · United States | HIGH | 26 grains/m³ |
| Sendai · Japan | HIGH | 26 grains/m³ |
| Trondheim · Norway | HIGH | 25 grains/m³ |
| Winnipeg · Canada | HIGH | 25 grains/m³ |
Timothy Grass Pollen season by country
Typical windows from our country pollen calendars; the weather shifts them earlier or later each year.
| Country | Season | Peak |
|---|---|---|
| Germany | May–Aug | Jun–Jul |
| Japan | May–Aug | Jun–Jul |
| United Kingdom | May–Aug | Jun–Jul |
| United States | May–Aug | Jun–Jul |
About Timothy Grass Pollen
Timothy is a tall hay-meadow grass grown across the temperate world for fodder. In allergy clinics it is the reference grass: its allergens Phl p 1 and Phl p 5 are the ones most grass-pollen extracts, skin tests and immunotherapy tablets are standardised against. A positive timothy test usually points to a wider allergy to the other temperate, cool-season grasses (ryegrass, cocksfoot, fescue and the meadow grasses), whose proteins closely resemble timothy’s. It is a much poorer guide to warm-climate grasses such as Bermuda or Bahia grass, which sit on a more distant branch of the grass family.
It flowers later than many grasses, from June into July in most of Europe and North America, which keeps the grass season going after the earlier meadow grasses have finished. Counts are highest on warm, dry days with a breeze, and fall away quickly in wet weather.