Frost dates for 03579Errol, NH
The average last spring frost in Errol is May 19 and the average first fall frost is October 1, giving a typical growing season of about 133 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 19
- Average first fall frost
- Oct 1
- Growing season
- 133 days
Safer after May 31 (1-in-10 risk)
Possible by Sep 19 (1-in-10 risk)
Last frost typically in 199 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 18 · May 31 · Jun 11 | Sep 5 · Sep 19 · Oct 1 | 110 days | 100% |
| Frost / freeze (32°F) | May 5 · May 19 · May 31 | Sep 19 · Oct 1 · Oct 13 | 133 days | 100% |
| Hard freeze (28°F) | Apr 24 · May 5 · May 19 | Sep 30 · Oct 11 · Oct 28 | 158 days | 100% |
Planting calendar for Errol
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 | Apr 18 – Jun 24 |
| Tomatoes | Transplant outdoors | Jun 4 – Jun 11 |
| Peppers | Start seeds indoors | Apr 18 – May 19 |
| Peppers | Transplant outdoors | Jun 18 – Jul 19 |
| Eggplant | Start seeds indoors | May 5 – Jun 3 |
| Eggplant | Transplant outdoors | Jun 18 – Jul 19 |
| Cucumbers | Sow outdoors | Jun 18 – Jun 21 |
| Summer squash | Sow outdoors | Jun 4 – Jul 19 |
| Winter squash & pumpkins | Sow outdoors | Jun 18 – Jul 19 |
| Snap beans | Sow outdoors | Jun 4 – Jul 14 |
| Sweet corn | Sow outdoors | Jun 4 – Jun 11 |
| Watermelon & cantaloupe | Sow outdoors | Jun 18 – Jul 19 |
| Okra | Sow outdoors | Jun 11 – Jul 4 |
| Peas | Sow outdoors (spring) | Apr 18 – Jun 3 |
| Potatoes | Plant outdoors (spring) | Apr 18 – Jun 18 |
| Onions | Start seeds indoors (spring) | Mar 7 – Apr 3 |
| Onions | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (spring) | Mar 31 – May 4 |
| Broccoli | Transplant outdoors (spring) | May 5 – Jun 3 |
| Broccoli | Start seeds indoors (fall) | Jun 1 – Jun 11 |
| Broccoli | Transplant outdoors (fall) | Jul 1 – Jul 12 |
| Cabbage | Start seeds indoors (spring) | Mar 21 – Apr 18 |
| Cabbage | Transplant outdoors (spring) | Apr 18 – May 19 |
| Cabbage | Start seeds indoors (fall) | May 22 – Jun 21 |
| Cabbage | Transplant outdoors (fall) | Jun 21 – Jul 22 |
| Leaf lettuce | Sow outdoors (spring) | Apr 18 – Jul 4 |
| Leaf lettuce | Sow outdoors (fall) | Jun 21 – Aug 7 |
| Spinach | Sow outdoors (spring) | Apr 11 – May 25 |
| Spinach | Sow outdoors (fall) | Jul 8 – Aug 12 |
| Radishes | Sow outdoors (spring) | Apr 18 – Jun 8 |
| Radishes | Sow outdoors (fall) | Jun 21 – Aug 22 |
| Kale | Sow outdoors (spring) | May 5 – May 25 |
| Kale | Sow outdoors (fall) | Jun 14 – Jul 22 |
| Carrots | Sow outdoors (spring) | May 19 – Jul 4 |
| Carrots | Sow outdoors (fall) | May 22 – Jul 7 |
| Garlic | Plant outdoors (fall) | Sep 21 – Oct 22 |
Where these dates come from
ZIP code 03579 is matched to the NOAA station Middle Dam, ME, 17.7 km away, at 1,460 ft elevation (72 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Middle Dam, ME (used) | 1,460 ft | May 19 | Oct 1 |
| Errol Ap, NH | 1,240 ft | May 21 | Sep 22 |
| Berlin Muni Ap, NH | 1,158 ft | May 30 | Sep 19 |
| Colebrook 3Sw, NH | 1,120 ft | May 31 | Sep 21 |
Frost dates near Errol
- Newry, ME 04261 · last May 19, first Oct 1
- Mount Washington, NH 03589 · last May 23, first Sep 22
- West Stewartstown, NH 03597 · last May 23, first Sep 22
- Milan, NH 03588 · last May 30, first Sep 19
- Colebrook, NH 03576 · last May 31, first Sep 21
- Andover, ME 04216 · last May 19, first Sep 25
- Oquossoc, ME 04964 · last May 23, first Sep 27
- North Stratford, NH 03590 · last May 23, first Sep 22
Frequently asked questions
- When is the last frost in Errol, NH?
- For ZIP code 03579, the average last spring frost (32°F) is May 19, based on NOAA 1991-2020 climate normals for the Middle Dam, ME weather station. There is a 1-in-10 chance of a frost after May 31.
- When is the first frost in Errol, NH?
- The average first fall frost (32°F) is October 1. There is a 1-in-10 chance of frost by September 19, so tender plants are at risk from that point on.
- How long is the growing season in 03579?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 133 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.