Errol, NH frost dates
Last spring frostMay 21median date
First fall frostSep 22median date
Growing season124 daysfrost-free
Hardiness zone4bZone 4b
How Errol compares
- In 8 years out of 10, the last spring frost in Errol falls between May 7 and June 3, a 27-day window. The first fall frost falls between September 9 and October 4.
- The median last frost is 14 days later than the New Hampshire median of May 7.
- Its 124-day growing season is longer than 4% of the 252 New Hampshire places with a regular frost season (state median 150 days).
- The last frost is 13 days later than the zone 4b median of May 8. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 4b chart.
- The weather station records an average of 197 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 7 |
| 50% (median) | May 21 |
| 10% (safe for tender plants) | June 3 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 9 |
| 50% (median) | September 22 |
| 90% (late) | October 4 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Errol, NH
Errol, NH frost dates — last frost May 21, first frost Sep 22, zone 4b. whenisthelastfrost.com
Crop
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Start indoors: Feb 26 to Mar 12Transplant outside: Apr 23 to May 7
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 12 to Mar 26Transplant outside: Jun 4 to Jun 18
Start indoors: Mar 26 to Apr 9Transplant outside: May 28 to Jun 11
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Sow outdoors: Apr 23 to May 28Plant for fall: Jul 28 to Aug 25
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 23 to May 7Sow outdoors: Apr 23 to May 7Plant for fall: Jul 14 to Aug 4
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 16 to Jul 7
Start indoors: Mar 26 to Apr 9Transplant outside: Apr 30 to May 14Plant for fall: Jun 16 to Jul 7
Start indoors: Mar 26 to Apr 9Transplant outside: May 7 to May 21Plant for fall: Jun 16 to Jul 7
Start indoors: Apr 9 to Apr 23Transplant outside: Jun 11 to Jun 25Sow outdoors: Jun 11 to Jun 25
Start indoors: Apr 9 to Apr 23Transplant outside: May 28 to Jun 11
Sow outdoors: Apr 9 to Apr 30Plant for fall: Jun 30 to Jul 21
Sow outdoors: Apr 9 to Apr 30Plant for fall: Jul 28 to Aug 18
Sow outdoors: Apr 16 to May 28Plant for fall: Aug 11 to Sep 1
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 11Sow outdoors: May 28 to Jun 11Plant for fall: Jul 7 to Jul 21
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11Plant for fall: Jul 14 to Jul 28
Start indoors: Apr 23 to Apr 30Sow outdoors: May 28 to Jun 11
Start indoors: Apr 23 to Apr 30Transplant outside: Jun 4 to Jun 18
Sow outdoors: Apr 30 to May 28Plant for fall: Jun 30 to Jul 14
Sow outdoors: Apr 30 to May 28Plant for fall: Jul 14 to Jul 28
Sow outdoors: Apr 30 to May 21
Sow outdoors: May 7 to Jun 4Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 7 to May 28Plant for fall: Jul 28 to Aug 18
Sow outdoors: May 28 to Jun 18Plant for fall: Jul 7 to Jul 21
Sow outdoors: May 28 to Jun 11
Transplant outside: Jun 4 to Jun 25
Plant for fall: Sep 8 to Oct 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Errol, NH
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 26 – Mar 12 | Apr 23 – May 7 | — | — |
| Peppers | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Eggplant | Mar 12 – Mar 26 | Jun 4 – Jun 18 | — | — |
| Tomatoes | Mar 26 – Apr 9 | May 28 – Jun 11 | — | — |
| Lettuce | Mar 26 – Apr 9 | Apr 30 – May 14 | Apr 23 – May 28 | Jul 28 – Aug 25 |
| Kale | Mar 26 – Apr 9 | Apr 23 – May 7 | Apr 23 – May 7 | Jul 14 – Aug 4 |
| Broccoli | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 16 – Jul 7 |
| Cabbage | Mar 26 – Apr 9 | Apr 30 – May 14 | — | Jun 16 – Jul 7 |
| Cauliflower | Mar 26 – Apr 9 | May 7 – May 21 | — | Jun 16 – Jul 7 |
| Okra | Apr 9 – Apr 23 | Jun 11 – Jun 25 | Jun 11 – Jun 25 | — |
| Basil | Apr 9 – Apr 23 | May 28 – Jun 11 | — | — |
| Peas | — | — | Apr 9 – Apr 30 | Jun 30 – Jul 21 |
| Spinach | — | — | Apr 9 – Apr 30 | Jul 28 – Aug 18 |
| Radishes | — | — | Apr 16 – May 28 | Aug 11 – Sep 1 |
| Cucumbers | Apr 23 – Apr 30 | Jun 4 – Jun 11 | May 28 – Jun 11 | Jul 7 – Jul 21 |
| Zucchini & Summer Squash | Apr 23 – Apr 30 | — | May 28 – Jun 11 | Jul 14 – Jul 28 |
| Winter Squash & Pumpkins | Apr 23 – Apr 30 | — | May 28 – Jun 11 | — |
| Melons & Watermelon | Apr 23 – Apr 30 | Jun 4 – Jun 18 | — | — |
| Carrots | — | — | Apr 30 – May 28 | Jun 30 – Jul 14 |
| Beets | — | — | Apr 30 – May 28 | Jul 14 – Jul 28 |
| Potatoes | — | — | Apr 30 – May 21 | — |
| Swiss Chard | — | — | May 7 – Jun 4 | Jul 14 – Jul 28 |
| Cilantro | — | — | May 7 – May 28 | Jul 28 – Aug 18 |
| Green Beans | — | — | May 28 – Jun 18 | Jul 7 – Jul 21 |
| Sweet Corn | — | — | May 28 – Jun 11 | — |
| Sweet Potatoes | — | Jun 4 – Jun 25 | — | — |
| Garlic | — | — | — | Sep 8 – Oct 13 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Errol Ap, NH weather station, 2 km away (elevation 1,240 ft (378 m)).
Frost dates near Errol
- Mount Washington May 19 · Sep 29
- West Stewartstown May 19 · Sep 29
- Milan May 30 · Sep 19
- Colebrook May 31 · Sep 21
- North Stratford May 19 · Sep 29
- Berlin May 14 · Sep 30
- Pittsburg May 25 · Sep 24
- Groveton May 19 · Sep 29
- Gorham May 14 · Sep 26
- Lancaster May 18 · Sep 30
Frequently asked questions
When is the last frost in Errol, NH?
The median last spring frost in Errol, NH is May 21. There is still about a 10% chance of frost after June 3, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Errol, NH?
The median first fall frost is September 22, with about a 10% chance of frost before September 9.
How long is the growing season in Errol, NH?
About 124 days between the median last spring frost and first fall frost.
What planting zone is Errol, NH?
Errol, NH is in USDA hardiness zone 4b.