Berlin, NH frost dates
Last spring frostMay 14median date
First fall frostSep 30median date
Growing season139 daysfrost-free
Hardiness zone4bZone 4b
How Berlin compares
- In 8 years out of 10, the last spring frost in Berlin falls between April 30 and May 30, a 30-day window. The first fall frost falls between September 15 and October 11.
- 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 6 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 174 nights a year at or below 32°F.
- Compared with Portland, ME, 117 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) | April 30 |
| 50% (median) | May 14 |
| 10% (safe for tender plants) | May 30 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 15 |
| 50% (median) | September 30 |
| 90% (late) | October 11 |
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 Berlin, NH
Berlin, NH frost dates — last frost May 14, first frost Sep 30, zone 4b. 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 Berlin, 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 Berlin, NH weather station, 3 km away (elevation 919 ft (280 m)).
Frost dates near Berlin
- Gorham May 14 · Sep 26
- Milan May 30 · Sep 19
- Randolph May 14 · Sep 26
- Jefferson May 8 · Oct 1
- Groveton May 19 · Sep 29
- Mount Washington May 19 · Sep 29
- West Stewartstown May 19 · Sep 29
- Lancaster May 18 · Sep 30
- Bretton Woods frost any month
- Jackson May 18 · Oct 1
Frequently asked questions
When is the last frost in Berlin, NH?
The median last spring frost in Berlin, NH is May 14. There is still about a 10% chance of frost after May 30, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Berlin, NH?
The median first fall frost is September 30, with about a 10% chance of frost before September 15.
How long is the growing season in Berlin, NH?
About 139 days between the median last spring frost and first fall frost.
What planting zone is Berlin, NH?
Berlin, NH is in USDA hardiness zone 4b.