Frost dates for 03053Londonderry, NH
The average last spring frost in Londonderry is April 21 and the average first fall frost is October 19, giving a typical growing season of about 180 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 21
- Average first fall frost
- Oct 19
- Growing season
- 180 days
Safer after May 6 (1-in-10 risk)
Possible by Oct 4 (1-in-10 risk)
Last frost typically in 171 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 23 · May 4 · May 19 | Sep 28 · Oct 7 · Oct 22 | 156 days | 100% |
| Frost / freeze (32°F) | Apr 8 · Apr 21 · May 6 | Oct 4 · Oct 19 · Nov 4 | 180 days | 100% |
| Hard freeze (28°F) | Mar 28 · Apr 7 · Apr 21 | Oct 16 · Nov 1 · Nov 15 | 206 days | 100% |
Planting calendar for Londonderry
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 21 – May 27 |
| Tomatoes | Transplant outdoors | May 7 – Jun 29 |
| Peppers | Start seeds indoors | Mar 21 – Apr 21 |
| Peppers | Transplant outdoors | May 21 – Jun 21 |
| Eggplant | Start seeds indoors | Apr 7 – May 6 |
| Eggplant | Transplant outdoors | May 21 – Jun 21 |
| Cucumbers | Sow outdoors | May 21 – Jul 9 |
| Summer squash | Sow outdoors | May 7 – Jun 21 |
| Winter squash & pumpkins | Sow outdoors | May 21 – Jun 21 |
| Snap beans | Sow outdoors | May 7 – Aug 1 |
| Sweet corn | Sow outdoors | May 7 – Jun 29 |
| Watermelon & cantaloupe | Sow outdoors | May 21 – Jun 21 |
| Okra | Sow outdoors | May 14 – Jun 6 |
| Peas | Sow outdoors (spring) | Mar 21 – May 6 |
| Potatoes | Plant outdoors (spring) | Mar 21 – May 21 |
| Onions | Start seeds indoors (spring) | Feb 7 – Mar 6 |
| Onions | Transplant outdoors (spring) | Apr 7 – May 6 |
| Broccoli | Start seeds indoors (spring) | Mar 3 – Apr 6 |
| Broccoli | Transplant outdoors (spring) | Apr 7 – May 6 |
| Broccoli | Start seeds indoors (fall) | Jun 19 – Jun 29 |
| Broccoli | Transplant outdoors (fall) | Jul 19 – Jul 30 |
| Cabbage | Start seeds indoors (spring) | Feb 21 – Mar 21 |
| Cabbage | Transplant outdoors (spring) | Mar 21 – Apr 21 |
| Cabbage | Start seeds indoors (fall) | Jun 9 – Jul 9 |
| Cabbage | Transplant outdoors (fall) | Jul 9 – Aug 9 |
| Leaf lettuce | Sow outdoors (spring) | Mar 21 – Jun 6 |
| Leaf lettuce | Sow outdoors (fall) | Jul 9 – Aug 25 |
| Spinach | Sow outdoors (spring) | Mar 14 – Apr 27 |
| Spinach | Sow outdoors (fall) | Jul 26 – Aug 30 |
| Radishes | Sow outdoors (spring) | Mar 21 – May 11 |
| Radishes | Sow outdoors (fall) | Jul 9 – Sep 9 |
| Kale | Sow outdoors (spring) | Apr 7 – Apr 27 |
| Kale | Sow outdoors (fall) | Jul 2 – Aug 9 |
| Carrots | Sow outdoors (spring) | Apr 21 – Jun 6 |
| Carrots | Sow outdoors (fall) | Jun 9 – Jul 25 |
| Garlic | Plant outdoors (fall) | Oct 9 – Nov 9 |
Where these dates come from
ZIP code 03053 is matched to the NOAA station Manchester Ap, NH, 9 km away, at 225 ft elevation (178 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Manchester Ap, NH (used) | 225 ft | Apr 21 | Oct 19 |
| Hudson 1 Sse, NH | 185 ft | May 3 | Oct 8 |
| Nashua 2 Nnw, NH | 135 ft | Apr 30 | Oct 12 |
| Massabesic Lake, NH | 253 ft | Apr 30 | Oct 11 |
Frost dates near Londonderry
- Derry, NH 03038 · last Apr 21, first Oct 19
- Litchfield, NH 03052 · last May 3, first Oct 8
- East Derry, NH 03041 · last Apr 30, first Oct 11
- Windham, NH 03087 · last May 3, first Oct 8
- Merrimack, NH 03054 · last Apr 21, first Oct 19
- Hudson, NH 03051 · last May 3, first Oct 8
- Manchester, NH 03109 · last Apr 30, first Oct 11
- Nashua, NH 03064 · last Apr 30, first Oct 12
Frequently asked questions
- When is the last frost in Londonderry, NH?
- For ZIP code 03053, the average last spring frost (32°F) is April 21, based on NOAA 1991-2020 climate normals for the Manchester Ap, NH weather station. There is a 1-in-10 chance of a frost after May 6.
- When is the first frost in Londonderry, NH?
- The average first fall frost (32°F) is October 19. There is a 1-in-10 chance of frost by October 4, so tender plants are at risk from that point on.
- How long is the growing season in 03053?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 180 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.