When to plant in Nashua, NH
USDA Zone 6aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Nashua, New Hampshire — all computed from Nashua's nearest NOAA weather station.
Zone 6a means Nashua sees real winter cold, but a good range of perennials survive; the frost dates above govern when annual vegetables go out.
Frost probability
NASHUA CWSU · 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 Nashua’s own odds, recorded at NASHUA CWSU.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 23 | May 10 | Apr 29 | Sep 21 | Oct 1 | Oct 12 |
| 32°F | May 11 | Apr 29 | Apr 16 | Sep 28 | Oct 8 | Oct 25 |
| 28°F | Apr 28 | Apr 16 | Apr 3 | Oct 6 | Oct 20 | Nov 5 |
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 Nashua, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 7 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.
Nashua planting FAQ
When is the last spring frost in Nashua, NH?
On average, the last spring frost in Nashua is around April 29 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Nashua, NH?
The first fall frost in Nashua typically arrives around October 8 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Nashua in?
Nashua is in USDA hardiness zone 6a. In zone 6a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Nashua?
There are roughly 162 frost-free days in Nashua (a moderate growing season), running from the average last frost around April 29 to the first fall frost near October 8.
When should I plant tomatoes in Nashua?
In Nashua, start tomato seeds indoors around March 4–March 18, then transplant seedlings outdoors around May 6 once the danger of frost has passed.
Never miss a window in Nashua
An email when it’s time to start seeds, transplant, and sow — timed to Nashua’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Londonderry · 16 km
- Lowell · 18 km
- Derry · 23 km
- Methuen · 25 km
- Manchester · 26 km
- Lawrence · 27 km
- Fitchburg · 31 km
- Haverhill · 33 km
Frost dates recorded at NASHUA CWSU, 2 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 Nashua, NH — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00275703. Retrieved from https://blissgarden.com/new-hampshire/nashua.