Frost dates for 03841Hampstead, NH
The average last spring frost in Hampstead is April 30 and the average first fall frost is October 11, giving a typical growing season of about 162 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 30
- Average first fall frost
- Oct 11
- Growing season
- 162 days
Safer after May 14 (1-in-10 risk)
Possible by Sep 29 (1-in-10 risk)
Last frost typically in 178 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) | May 1 · May 13 · May 25 | Sep 19 · Oct 1 · Oct 14 | 141 days | 100% |
| Frost / freeze (32°F) | Apr 20 · Apr 30 · May 14 | Sep 29 · Oct 11 · Oct 27 | 162 days | 100% |
| Hard freeze (28°F) | Apr 5 · Apr 18 · May 1 | Oct 8 · Oct 24 · Nov 7 | 187 days | 100% |
Planting calendar for Hampstead
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 30 – Jun 5 |
| Tomatoes | Transplant outdoors | May 16 – Jun 21 |
| Peppers | Start seeds indoors | Mar 30 – Apr 30 |
| Peppers | Transplant outdoors | May 30 – Jun 30 |
| Eggplant | Start seeds indoors | Apr 16 – May 15 |
| Eggplant | Transplant outdoors | May 30 – Jun 30 |
| Cucumbers | Sow outdoors | May 30 – Jul 1 |
| Summer squash | Sow outdoors | May 16 – Jun 30 |
| Winter squash & pumpkins | Sow outdoors | May 30 – Jun 30 |
| Snap beans | Sow outdoors | May 16 – Jul 24 |
| Sweet corn | Sow outdoors | May 16 – Jun 21 |
| Watermelon & cantaloupe | Sow outdoors | May 30 – Jun 30 |
| Okra | Sow outdoors | May 23 – Jun 15 |
| Peas | Sow outdoors (spring) | Mar 30 – May 15 |
| Potatoes | Plant outdoors (spring) | Mar 30 – May 30 |
| Onions | Start seeds indoors (spring) | Feb 16 – Mar 15 |
| Onions | Transplant outdoors (spring) | Apr 16 – May 15 |
| Broccoli | Start seeds indoors (spring) | Mar 12 – Apr 15 |
| Broccoli | Transplant outdoors (spring) | Apr 16 – May 15 |
| Broccoli | Start seeds indoors (fall) | Jun 11 – Jun 21 |
| Broccoli | Transplant outdoors (fall) | Jul 11 – Jul 22 |
| Cabbage | Start seeds indoors (spring) | Mar 2 – Mar 30 |
| Cabbage | Transplant outdoors (spring) | Mar 30 – Apr 30 |
| Cabbage | Start seeds indoors (fall) | Jun 1 – Jul 1 |
| Cabbage | Transplant outdoors (fall) | Jul 1 – Aug 1 |
| Leaf lettuce | Sow outdoors (spring) | Mar 30 – Jun 15 |
| Leaf lettuce | Sow outdoors (fall) | Jul 1 – Aug 17 |
| Spinach | Sow outdoors (spring) | Mar 23 – May 6 |
| Spinach | Sow outdoors (fall) | Jul 18 – Aug 22 |
| Radishes | Sow outdoors (spring) | Mar 30 – May 20 |
| Radishes | Sow outdoors (fall) | Jul 1 – Sep 1 |
| Kale | Sow outdoors (spring) | Apr 16 – May 6 |
| Kale | Sow outdoors (fall) | Jun 24 – Aug 1 |
| Carrots | Sow outdoors (spring) | Apr 30 – Jun 15 |
| Carrots | Sow outdoors (fall) | Jun 1 – Jul 17 |
| Garlic | Plant outdoors (fall) | Oct 1 – Nov 1 |
Where these dates come from
ZIP code 03841 is matched to the NOAA station W Hampstead, NH, 3.8 km away, at 288 ft elevation (119 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| W Hampstead, NH (used) | 288 ft | Apr 30 | Oct 11 |
| Haverhill, MA | 20 ft | May 1 | Oct 12 |
| Epping, NH | 160 ft | May 7 | Oct 4 |
| Groveland, MA | 30 ft | May 3 | Oct 8 |
Frost dates near Hampstead
- East Hampstead, NH 03826 · last May 7, first Oct 4
- Atkinson, NH 03811 · last Apr 21, first Oct 21
- Sandown, NH 03873 · last May 7, first Oct 4
- North Salem, NH 03073 · last May 3, first Oct 8
- Danville, NH 03819 · last May 7, first Oct 4
- Plaistow, NH 03865 · last May 1, first Oct 12
- East Derry, NH 03041 · last Apr 30, first Oct 11
- Kingston, NH 03848 · last May 7, first Oct 4
Frequently asked questions
- When is the last frost in Hampstead, NH?
- For ZIP code 03841, the average last spring frost (32°F) is April 30, based on NOAA 1991-2020 climate normals for the W Hampstead, NH weather station. There is a 1-in-10 chance of a frost after May 14.
- When is the first frost in Hampstead, NH?
- The average first fall frost (32°F) is October 11. There is a 1-in-10 chance of frost by September 29, so tender plants are at risk from that point on.
- How long is the growing season in 03841?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 162 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.