
Dr. Ami Mehra
Allergy & Asthma Specialists
Check today's pollen count by city in New Hampshire. Explore local allergy forecasts, monitor common seasonal allergens, and use city-level trends to plan around high pollen days.
Allergy Ava organizes statewide and local pollen information so you can compare conditions, anticipate seasonal flare-ups, and find relevant allergy forecast pages faster.
Pollen levels in New Hampshire can vary by city, weather, vegetation, and season. Choose a local forecast below to see the current allergy index, main allergen, and 5-day outlook for cities including Manchester, Nashua, Concord, Dover, Derry, Rochester.
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Local allergy care
Use today's pollen forecast alongside nearby allergy and immunology profiles when symptoms need clinical follow-up, testing, or long-term treatment planning.

Allergy & Asthma Specialists

Southern New Hampshire Asthma & Allergy

Southern New Hampshire Asthma & Allergy

Dartmouth Hitchcock Medical Center

Allergy & Asthma Specialists

Dartmouth Hitchcock Medical Center
Showing 6 of 30 published allergist profiles in this area.
New Hampshire allergy sufferers can use this page to monitor pollen trends and find relevant city forecasts when available. Pollen levels vary by season, with tree pollen often peaking in spring, grass pollen becoming more active in late spring and summer, and weed pollen, especially ragweed, remaining a concern in late summer and fall.
Use Allergy Ava's city-level forecasts to plan outdoor activities, manage medication timing, and stay informed about the allergens most prevalent in your area. Our data is updated regularly to give you the most accurate picture of current conditions.
Comparing nearby states can help you understand regional allergy shifts, seasonal pollen timing, and conditions that may affect travel or outdoor plans.
New Hampshire pollen conditions can vary between Manchester, Nashua, Concord, and smaller inland communities because elevation, tree density, rainfall, and seasonal temperature changes all affect allergen timing. Searchers looking for a New Hampshire pollen count often want local context during spring and summer allergy periods.
Tree pollen is commonly important in spring, followed by grasses and later weeds. City-level pages help show how daily conditions may differ across southern New Hampshire and nearby New England areas.
Manchester and Nashua are warmer, denser, and more suburbanized, with more commuter corridors, lawns, and urban heat effects. Concord has more central river-valley and inland-wood influence, so bloom timing and daily pollen mixing can differ.
Sometimes, but not consistently. A cool onshore breeze may dilute or redirect pollen near Dover, while inland wind can bring tree, grass, or weed pollen back toward the Seacoast. Humidity can also make mold-sensitive symptoms more noticeable.
Grass pollen usually becomes important in May and can remain active through July. The roughest days often come when warm, dry weather follows a period of fast lawn, field, and roadside growth.
A fast warmup can push multiple trees to release pollen at once, especially maple, birch, oak, and ash. If that overlaps with early grass activity and dry wind, symptoms can feel sharper than the calendar alone would suggest.
Today's statewide signal
New Hampshire allergy conditions can shift quickly between the Merrimack Valley, southern commuter suburbs, the Seacoast transition zone, and wooded inland communities. Compare Manchester, Nashua, Concord, Dover, Derry, Rochester, Salem, and Merrimack for local pollen levels, dominant allergens, weather context, and short-term trend signals.
Data updates regularly to reflect current conditions across New Hampshire cities.
Highest city index now
Rochester
Ragweed · Moderate
3
Live city comparison
Sort New Hampshire cities by pollen index, temperature, or trend. Select a city for its full local forecast.
| Main allergen | Weather context | ||||
|---|---|---|---|---|---|
| Rochester | 3Moderate | Ragweed | Rising Forecast moves toward high conditions tomorrow. | 76°F | Humid Humid air may keep ragweed and outdoor mold irritation active. |
| Manchester | 2Low | Elm | Stable Tomorrow looks similar, near low conditions. | 76°F | Breezy Breezy conditions may lift pollen from trees, grasses, weeds, and surfaces. |
| Nashua | 2Low | Elm | Stable Tomorrow looks similar, near low conditions. | 76°F | Partly sunny Watch elm levels and limit long outdoor exposure during peak hours. |
| Concord | 2Low | Elm | Falling Forecast eases toward very low conditions tomorrow. | 76°F | Partly sunny Watch elm levels and limit long outdoor exposure during peak hours. |
| Dover | 2Low | Elm | Falling Forecast eases toward very low conditions tomorrow. | 76°F | Partly sunny Watch elm levels and limit long outdoor exposure during peak hours. |
| Derry | 2Low | Elm | Stable Tomorrow looks similar, near low conditions. | 76°F | Humid Watch elm levels and limit long outdoor exposure during peak hours. |
| Salem | 2Low | Elm | Falling Forecast eases toward very low conditions tomorrow. | 76°F | Partly sunny Watch elm levels and limit long outdoor exposure during peak hours. |
| Merrimack | 2Low | Elm | Falling Forecast eases toward none conditions tomorrow. | 76°F | Partly sunny Watch elm levels and limit long outdoor exposure during peak hours. |
Ragweed is the main allergen
Pollen index
3
Trend
Rising
Humid air may keep ragweed and outdoor mold irritation active.
Elm is the main allergen
Pollen index
2
Trend
Stable
Breezy conditions may lift pollen from trees, grasses, weeds, and surfaces.
Elm is the main allergen
Pollen index
2
Trend
Stable
Watch elm levels and limit long outdoor exposure during peak hours.
Elm is the main allergen
Pollen index
2
Trend
Falling
Watch elm levels and limit long outdoor exposure during peak hours.
Elm is the main allergen
Pollen index
2
Trend
Falling
Watch elm levels and limit long outdoor exposure during peak hours.
Elm is the main allergen
Pollen index
2
Trend
Stable
Watch elm levels and limit long outdoor exposure during peak hours.
Elm is the main allergen
Pollen index
2
Trend
Falling
Watch elm levels and limit long outdoor exposure during peak hours.
Elm is the main allergen
Pollen index
2
Trend
Falling
Watch elm levels and limit long outdoor exposure during peak hours.
Regional allergy forecast
Southern New Hampshire combines warmer suburban neighborhoods, hardwood street trees, lawns, road corridors, and commuter-belt development. Spring maple and oak can build early, while grass and ragweed often spread efficiently on dry, breezy days.
Concord’s pollen pattern is shaped by river-valley air, wooded neighborhoods, state-office and campus landscaping, parks, and open edges that can hold pollen during calm mornings before wind mixes the air.
Dover and Rochester sit where coastal moisture, river corridors, inland woods, fields, and Seacoast wind shifts meet. Humid spells can make mold more noticeable, while spring trees and summer grasses vary block by block.
State-specific pollen calendar
April to May
Maple, birch, oak, ash, willow, pine, and other trees can drive spring symptoms. Southern New Hampshire may start earlier during warm late-March stretches, while cooler inland pockets may lag.
May to July
Timothy, orchard grass, fescue, ryegrass, lawns, athletic fields, roadsides, and hay fields can raise grass pollen as late-spring warmth arrives.
August to October
Ragweed is the main late-season trigger, with plantain, pigweed, amaranth, wormwood-type weeds, and roadside vegetation adding pressure until repeated frosts slow the season.
November to March
Hard freezes usually reduce outdoor pollen, but indoor dust, pet dander, dry heated air, damp basements, and leaf-litter mold can still irritate sensitive residents.
Weather-pollen correlation
Wind can disperse pollen, rain can temporarily wash particles down, and humidity can increase mold irritation. The city table combines pollen and weather signals so users can compare outdoor risk without opening every city page.