When to plant in Londonderry, NH
USDA Zone 6aLondonderry, New Hampshire frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
In zone 6a, Londonderry gardeners can grow many hardy perennials, while the last and first frost still dictate the annual vegetable calendar.
The average last spring frost in Londonderry is now 5 days earlier than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
HUDSON 1 SSE · 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 Londonderry’s own odds, recorded at HUDSON 1 SSE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 26 | May 13 | May 2 | Sep 17 | Sep 30 | Oct 10 |
| 32°F | May 16 | May 3 | Apr 24 | Sep 27 | Oct 8 | Oct 23 |
| 28°F | May 5 | Apr 22 | Apr 9 | Oct 4 | Oct 18 | Nov 3 |
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 Londonderry, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 11 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.
Londonderry planting FAQ
When is the last spring frost in Londonderry, NH?
Plan for the last spring frost in Londonderry around May 3 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Londonderry, NH?
In Londonderry, the first 32°F freeze of fall lands around October 8 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Londonderry in?
Londonderry 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 Londonderry?
Londonderry has about 158 frost-free days — a moderate growing season — between the average last spring frost (May 3) and first fall frost (October 8).
When should I plant tomatoes in Londonderry?
For Londonderry, sow tomatoes indoors about March 8–March 22 and move the seedlings out around May 10, after the last spring frost.
Never miss a window in Londonderry
An email when it’s time to start seeds, transplant, and sow — timed to Londonderry’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at HUDSON 1 SSE, 9 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 Londonderry, NH — Frost Dates & Zone 6a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00274234. Retrieved from https://blissgarden.com/new-hampshire/londonderry.