Effingham, NH frost dates
Last spring frostMay 14median date
First fall frostSep 30median date
Growing season139 daysfrost-free
Hardiness zone5aZone 5a
How Effingham compares
- In 8 years out of 10, the last spring frost in Effingham falls between May 3 and May 28, a 25-day window. The first fall frost falls between September 16 and October 12.
- The median last frost is 7 days later than the New Hampshire median of May 7.
- Its 139-day growing season is longer than 25% of the 252 New Hampshire places with a regular frost season (state median 150 days).
- The last frost is 11 days later than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 184 nights a year at or below 32°F.
- Compared with Portland, ME, 59 km away, the last frost here is 18 days later than there and the growing season is 33 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 3 |
| 50% (median) | May 14 |
| 10% (safe for tender plants) | May 28 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 16 |
| 50% (median) | September 30 |
| 90% (late) | October 12 |
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 Effingham, NH
Effingham, NH frost dates — last frost May 14, first frost Sep 30, zone 5a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 19 to Mar 5Transplant outside: Apr 16 to Apr 30
Start indoors: Mar 5 to Mar 19Transplant outside: May 28 to Jun 11
Start indoors: Mar 5 to Mar 19Transplant outside: May 28 to Jun 11
Start indoors: Mar 19 to Apr 2Transplant outside: May 21 to Jun 4
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 23 to May 7Sow outdoors: Apr 16 to May 21Plant for fall: Aug 5 to Sep 2
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 16 to Apr 30Sow outdoors: Apr 16 to Apr 30Plant for fall: Jul 22 to Aug 12
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 30 to May 14Plant for fall: Jun 24 to Jul 15
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 23 to May 7Plant for fall: Jun 24 to Jul 15
Start indoors: Mar 19 to Apr 2Transplant outside: Apr 30 to May 14Plant for fall: Jun 24 to Jul 15
Start indoors: Apr 2 to Apr 16Transplant outside: Jun 4 to Jun 18Sow outdoors: Jun 4 to Jun 18
Start indoors: Apr 2 to Apr 16Transplant outside: May 21 to Jun 4
Sow outdoors: Apr 2 to Apr 23Plant for fall: Jul 8 to Jul 29
Sow outdoors: Apr 2 to Apr 23Plant for fall: Aug 5 to Aug 26
Sow outdoors: Apr 9 to May 21Plant for fall: Aug 19 to Sep 9
Start indoors: Apr 16 to Apr 23Transplant outside: May 28 to Jun 4Sow outdoors: May 21 to Jun 4Plant for fall: Jul 15 to Jul 29
Start indoors: Apr 16 to Apr 23Sow outdoors: May 21 to Jun 4Plant for fall: Jul 22 to Aug 5
Start indoors: Apr 16 to Apr 23Sow outdoors: May 21 to Jun 4
Start indoors: Apr 16 to Apr 23Transplant outside: May 28 to Jun 11
Sow outdoors: Apr 23 to May 21Plant for fall: Jul 8 to Jul 22
Sow outdoors: Apr 23 to May 21Plant for fall: Jul 22 to Aug 5
Sow outdoors: Apr 23 to May 14
Sow outdoors: Apr 30 to May 28Plant for fall: Jul 22 to Aug 5
Sow outdoors: Apr 30 to May 21Plant for fall: Aug 5 to Aug 26
Sow outdoors: May 21 to Jun 11Plant for fall: Jul 15 to Jul 29
Sow outdoors: May 21 to Jun 4
Transplant outside: May 28 to Jun 18
Plant for fall: Sep 16 to Oct 21
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Effingham, NH
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 19 – Mar 5 | Apr 16 – Apr 30 | — | — |
| Peppers | Mar 5 – Mar 19 | May 28 – Jun 11 | — | — |
| Eggplant | Mar 5 – Mar 19 | May 28 – Jun 11 | — | — |
| Tomatoes | Mar 19 – Apr 2 | May 21 – Jun 4 | — | — |
| Lettuce | Mar 19 – Apr 2 | Apr 23 – May 7 | Apr 16 – May 21 | Aug 5 – Sep 2 |
| Kale | Mar 19 – Apr 2 | Apr 16 – Apr 30 | Apr 16 – Apr 30 | Jul 22 – Aug 12 |
| Broccoli | Mar 19 – Apr 2 | Apr 30 – May 14 | — | Jun 24 – Jul 15 |
| Cabbage | Mar 19 – Apr 2 | Apr 23 – May 7 | — | Jun 24 – Jul 15 |
| Cauliflower | Mar 19 – Apr 2 | Apr 30 – May 14 | — | Jun 24 – Jul 15 |
| Okra | Apr 2 – Apr 16 | Jun 4 – Jun 18 | Jun 4 – Jun 18 | — |
| Basil | Apr 2 – Apr 16 | May 21 – Jun 4 | — | — |
| Peas | — | — | Apr 2 – Apr 23 | Jul 8 – Jul 29 |
| Spinach | — | — | Apr 2 – Apr 23 | Aug 5 – Aug 26 |
| Radishes | — | — | Apr 9 – May 21 | Aug 19 – Sep 9 |
| Cucumbers | Apr 16 – Apr 23 | May 28 – Jun 4 | May 21 – Jun 4 | Jul 15 – Jul 29 |
| Zucchini & Summer Squash | Apr 16 – Apr 23 | — | May 21 – Jun 4 | Jul 22 – Aug 5 |
| Winter Squash & Pumpkins | Apr 16 – Apr 23 | — | May 21 – Jun 4 | — |
| Melons & Watermelon | Apr 16 – Apr 23 | May 28 – Jun 11 | — | — |
| Carrots | — | — | Apr 23 – May 21 | Jul 8 – Jul 22 |
| Beets | — | — | Apr 23 – May 21 | Jul 22 – Aug 5 |
| Potatoes | — | — | Apr 23 – May 14 | — |
| Swiss Chard | — | — | Apr 30 – May 28 | Jul 22 – Aug 5 |
| Cilantro | — | — | Apr 30 – May 21 | Aug 5 – Aug 26 |
| Green Beans | — | — | May 21 – Jun 11 | Jul 15 – Jul 29 |
| Sweet Corn | — | — | May 21 – Jun 4 | — |
| Sweet Potatoes | — | May 28 – Jun 18 | — | — |
| Garlic | — | — | — | Sep 16 – Oct 21 |
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 Hollis, ME weather station, 25 km away (elevation 305 ft (93 m)).
Frost dates near Effingham
- East Wakefield May 16 · Sep 30
- Ossipee May 6 · Oct 6
- Center Ossipee May 16 · Sep 26
- Freedom May 16 · Sep 26
- Sanbornville May 16 · Sep 30
- Wolfeboro Apr 30 · Oct 18
- West Ossipee May 16 · Sep 26
- Center Tuftonboro May 6 · Oct 6
- Milton Mills May 16 · Sep 30
- Wolfeboro Falls Apr 30 · Oct 18
Frequently asked questions
When is the last frost in Effingham, NH?
The median last spring frost in Effingham, NH is May 14. There is still about a 10% chance of frost after May 28, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Effingham, NH?
The median first fall frost is September 30, with about a 10% chance of frost before September 16.
How long is the growing season in Effingham, NH?
About 139 days between the median last spring frost and first fall frost.
What planting zone is Effingham, NH?
Effingham, NH is in USDA hardiness zone 5a.