When to plant in Concord, NH
USDA Zone 5bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Concord, New Hampshire — all computed from Concord's nearest NOAA weather station.
Zone 5b means Concord sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
The average last spring frost in Concord is now 5 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
CONCORD MUNI AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Concord’s own odds, recorded at CONCORD MUNI AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Jun 3 | May 20 | May 7 | Sep 9 | Sep 23 | Oct 5 |
| 32°F | May 22 | May 8 | Apr 27 | Sep 21 | Oct 3 | Oct 16 |
| 28°F | May 9 | Apr 27 | Apr 15 | Oct 1 | Oct 13 | Oct 30 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Concord, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Concord planting FAQ
When is the last spring frost in Concord, NH?
Concord's average last spring frost falls near May 8 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Concord, NH?
The first fall frost in Concord typically arrives around October 3 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Concord in?
Concord is in USDA hardiness zone 5b. In zone 5b, winters are cold — pick cold-hardy varieties and protect tender crops.
How long is the growing season in Concord?
There are roughly 148 frost-free days in Concord (a short growing season), running from the average last frost around May 8 to the first fall frost near October 3.
When should I plant tomatoes in Concord?
In Concord, start tomato seeds indoors around March 13–March 27, then transplant seedlings outdoors around May 15 once the danger of frost has passed.
Never miss a window in Concord
An email when it’s time to start seeds, transplant, and sow — timed to Concord’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Manchester · 29 km
- Laconia · 39 km
- Derry · 45 km
- Londonderry · 45 km
- Rochester · 48 km
- Durham · 53 km
- Nashua · 54 km
- Somersworth · 55 km
Frost dates recorded at CONCORD MUNI AP, 6 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Concord, NH — Frost Dates & Zone 5b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00014745. Retrieved from https://blissgarden.com/new-hampshire/concord.