New Hampshire pollen and allergy seasons
July outlookHigh
New Hampshire has a late spring tree season, grass in early summer, and a moderate ragweed season in the fall.
Twelve month pollen calendar
J
F
M
A
M
J
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A
S
O
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D
LowModerateHighVery high
Dominant species in July
Grass
Typical peak in July
early-July to mid-July
Worst month of the year
May
Best month of the year
January
What is active in July
Grass
Cities in New Hampshire
| City | Today | Worst today | Typical in July |
|---|---|---|---|
| Nashua | Very Highas of Jul 12 | Grass | High |
| Manchester | Very Highas of Jul 12 | Grass | High |
| Concord | Very Highas of Jul 12 | Grass | High |
| Rochester | Very Highas of Jul 12 | Grass | High |
| Lebanon | Very Highas of Jul 12 | Grass | High |
| East Wakefield | Very Highas of Jul 12 | Grass | High |
| Salem | Very Highas of Jul 12 | Grass | High |
| Exeter | Very Highas of Jul 12 | Grass | High |
| Fremont | Very Highas of Jul 12 | Grass | High |
| Temple | Very Highas of Jul 12 | Grass | High |
| Litchfield | Very Highas of Jul 12 | Grass | High |
| Lyndeborough | Very Highas of Jul 12 | Grass | High |
| Milford | Very Highas of Jul 12 | Grass | High |
| Alstead | Very Highas of Jul 12 | Grass | High |
| Atkinson | Very Highas of Jul 12 | Grass | High |
| New Boston | Very Highas of Jul 12 | Grass | High |
| Warner | Very Highas of Jul 12 | Grass | High |
| Lyme | Highas of Jul 12 | Grass | High |
| Boscawen | Highas of Jul 12 | Grass | High |
| Portsmouth | No live reading | Not available | High |
| Dover | No live reading | Not available | High |
| Keene | No live reading | Not available | High |
| Laconia | No live reading | Not available | High |
| Claremont | No live reading | Not available | High |
| Somersworth | No live reading | Not available | High |
| Chester | No live reading | Not available | High |
| Great Boars Head | No live reading | Not available | High |
| Meredith | No live reading | Not available | High |
| Newfields | No live reading | Not available | High |
| North Conway | No live reading | Not available | High |
| Pittsfield | No live reading | Not available | High |
| Suncook | No live reading | Not available | High |
| Hooksett | No live reading | Not available | High |
| Nottingham | No live reading | Not available | High |
| Wolfeboro | No live reading | Not available | High |
| Gilmanton | No live reading | Not available | High |
| Weare | No live reading | Not available | High |
| Hanover | No live reading | Not available | High |
| Lincoln | No live reading | Not available | High |
| Durham | No live reading | Not available | High |
| Hudson | No live reading | Not available | High |
| Berlin | No live reading | Not available | High |
| Woodsville | No live reading | Not available | High |
| Merrimack | No live reading | Not available | High |
| Candia | No live reading | Not available | High |
| Franklin | No live reading | Not available | High |
| Hampstead | No live reading | Not available | High |
| Bedford | No live reading | Not available | High |
| Derry | No live reading | Not available | High |
| Brookline | No live reading | Not available | High |
| Francestown | No live reading | Not available | High |
| Londonderry | No live reading | Not available | High |
| Epping | No live reading | Not available | High |
| Campton | No live reading | Not available | High |
| Newton | No live reading | Not available | High |
| Newmarket | No live reading | Not available | High |
| Windham | No live reading | Not available | High |
| Amherst | No live reading | Not available | High |
| Goffstown | No live reading | Not available | High |
| Springfield | No live reading | Not available | High |
| Ossipee | No live reading | Not available | High |
| New Durham | No live reading | Not available | High |
| Stratham | No live reading | Not available | High |
| Belmont | No live reading | Not available | High |
| Colebrook | No live reading | Not available | High |
| Bow | No live reading | Not available | High |
| Kingston | No live reading | Not available | High |
| Enfield Center | No live reading | Not available | High |
| Plymouth | No live reading | Not available | High |
| Monroe | No live reading | Not available | High |
| Tilton | No live reading | Not available | High |
| Sunapee | No live reading | Not available | High |
| Hillsboro | No live reading | Not available | High |
| Mont Vernon | No live reading | Not available | High |
| Newport | No live reading | Not available | High |
| Surry | No live reading | Not available | High |
| Jaffrey | No live reading | Not available | High |
| Enfield | No live reading | Not available | High |
| Gilford | No live reading | Not available | High |
| Littleton | No live reading | Not available | High |
| Mason | No live reading | Not available | High |
| Marlow | No live reading | Not available | High |
| Silver Lake | No live reading | Not available | High |
| Seabrook | No live reading | Not available | High |
| Center Conway | No live reading | Not available | High |
| Auburn | No live reading | Not available | High |
| Twin Mountain | No live reading | Not available | High |
| East Hampstead | No live reading | Not available | High |
| Melvin Village | No live reading | Not available | High |
| Walpole | No live reading | Not available | High |
| Hampton Falls | No live reading | Not available | High |
| Strafford | No live reading | Not available | High |
| Rindge | No live reading | Not available | High |
| Rollinsford | No live reading | Not available | High |
| Pittsburg | No live reading | Not available | High |
| Campton Lower Village | No live reading | Not available | High |
| Hampton | No live reading | Not available | High |
| Sanbornville | No live reading | Not available | High |
| Center Harbor | No live reading | Not available | High |
| Seabrook Beach | No live reading | Not available | High |
Today and worst today come from live readings where available. Typical shows the usual level for this month from the seasonal profile.
The New Hampshire allergy season
Allergy levels in New Hampshire peak in May, when birch pollen runs highest. The season moves through tree pollen around May, grass in June, weed pollen such as ragweed in September. Levels start to climb around April. The lowest pollen levels of the year arrive in January.
Common questions
When does allergy season start in New Hampshire?
Pollen levels in New Hampshire usually begin climbing in April and reach their highest point in May.
What is the worst month for allergies in New Hampshire?
May is typically the worst month in New Hampshire, driven by birch pollen.
When does ragweed season end in New Hampshire?
Ragweed pollen in New Hampshire usually fades by the end of October, after the first hard frost in colder areas.
When is the best time for allergies in New Hampshire?
January usually brings the lowest pollen levels of the year in New Hampshire.