Pittsburg, NH frost dates
Last spring frostMay 25median date
First fall frostSep 24median date
Growing season122 daysfrost-free
Hardiness zone4aZone 4a
How Pittsburg compares
- In 8 years out of 10, the last spring frost in Pittsburg falls between May 9 and June 8, a 30-day window. The first fall frost falls between September 9 and October 7.
- The median last frost is 18 days later than the New Hampshire median of May 7.
- Its 122-day growing season is longer than 3% 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 4a median of May 12. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 4a chart.
- The weather station records an average of 198 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 9 |
| 50% (median) | May 25 |
| 10% (safe for tender plants) | June 8 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 9 |
| 50% (median) | September 24 |
| 90% (late) | October 7 |
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 Pittsburg, NH
Pittsburg, NH frost dates — last frost May 25, first frost Sep 24, zone 4a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 27 to May 11
Start indoors: Mar 16 to Mar 30Transplant outside: Jun 8 to Jun 22
Start indoors: Mar 16 to Mar 30Transplant outside: Jun 8 to Jun 22
Start indoors: Mar 30 to Apr 13Transplant outside: Jun 1 to Jun 15
Start indoors: Mar 30 to Apr 13Transplant outside: May 4 to May 18Sow outdoors: Apr 27 to Jun 1Plant for fall: Jul 30 to Aug 27
Start indoors: Mar 30 to Apr 13Transplant outside: Apr 27 to May 11Sow outdoors: Apr 27 to May 11Plant for fall: Jul 16 to Aug 6
Start indoors: Mar 30 to Apr 13Transplant outside: May 11 to May 25Plant for fall: Jun 18 to Jul 9
Start indoors: Mar 30 to Apr 13Transplant outside: May 4 to May 18Plant for fall: Jun 18 to Jul 9
Start indoors: Mar 30 to Apr 13Transplant outside: May 11 to May 25Plant for fall: Jun 18 to Jul 9
Start indoors: Apr 13 to Apr 27Transplant outside: Jun 15 to Jun 29Sow outdoors: Jun 15 to Jun 29
Start indoors: Apr 13 to Apr 27Transplant outside: Jun 1 to Jun 15
Sow outdoors: Apr 13 to May 4Plant for fall: Jul 2 to Jul 23
Sow outdoors: Apr 13 to May 4Plant for fall: Jul 30 to Aug 20
Sow outdoors: Apr 20 to Jun 1Plant for fall: Aug 13 to Sep 3
Start indoors: Apr 27 to May 4Transplant outside: Jun 8 to Jun 15Sow outdoors: Jun 1 to Jun 15Plant for fall: Jul 9 to Jul 23
Start indoors: Apr 27 to May 4Sow outdoors: Jun 1 to Jun 15Plant for fall: Jul 16 to Jul 30
Start indoors: Apr 27 to May 4Sow outdoors: Jun 1 to Jun 15
Start indoors: Apr 27 to May 4Transplant outside: Jun 8 to Jun 22
Sow outdoors: May 4 to Jun 1Plant for fall: Jul 2 to Jul 16
Sow outdoors: May 4 to Jun 1Plant for fall: Jul 16 to Jul 30
Sow outdoors: May 4 to May 25
Sow outdoors: May 11 to Jun 8Plant for fall: Jul 16 to Jul 30
Sow outdoors: May 11 to Jun 1Plant for fall: Jul 30 to Aug 20
Sow outdoors: Jun 1 to Jun 22Plant for fall: Jul 9 to Jul 23
Sow outdoors: Jun 1 to Jun 15
Transplant outside: Jun 8 to Jun 29
Plant for fall: Sep 10 to Oct 15
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Pittsburg, NH
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 2 – Mar 16 | Apr 27 – May 11 | — | — |
| Peppers | Mar 16 – Mar 30 | Jun 8 – Jun 22 | — | — |
| Eggplant | Mar 16 – Mar 30 | Jun 8 – Jun 22 | — | — |
| Tomatoes | Mar 30 – Apr 13 | Jun 1 – Jun 15 | — | — |
| Lettuce | Mar 30 – Apr 13 | May 4 – May 18 | Apr 27 – Jun 1 | Jul 30 – Aug 27 |
| Kale | Mar 30 – Apr 13 | Apr 27 – May 11 | Apr 27 – May 11 | Jul 16 – Aug 6 |
| Broccoli | Mar 30 – Apr 13 | May 11 – May 25 | — | Jun 18 – Jul 9 |
| Cabbage | Mar 30 – Apr 13 | May 4 – May 18 | — | Jun 18 – Jul 9 |
| Cauliflower | Mar 30 – Apr 13 | May 11 – May 25 | — | Jun 18 – Jul 9 |
| Okra | Apr 13 – Apr 27 | Jun 15 – Jun 29 | Jun 15 – Jun 29 | — |
| Basil | Apr 13 – Apr 27 | Jun 1 – Jun 15 | — | — |
| Peas | — | — | Apr 13 – May 4 | Jul 2 – Jul 23 |
| Spinach | — | — | Apr 13 – May 4 | Jul 30 – Aug 20 |
| Radishes | — | — | Apr 20 – Jun 1 | Aug 13 – Sep 3 |
| Cucumbers | Apr 27 – May 4 | Jun 8 – Jun 15 | Jun 1 – Jun 15 | Jul 9 – Jul 23 |
| Zucchini & Summer Squash | Apr 27 – May 4 | — | Jun 1 – Jun 15 | Jul 16 – Jul 30 |
| Winter Squash & Pumpkins | Apr 27 – May 4 | — | Jun 1 – Jun 15 | — |
| Melons & Watermelon | Apr 27 – May 4 | Jun 8 – Jun 22 | — | — |
| Carrots | — | — | May 4 – Jun 1 | Jul 2 – Jul 16 |
| Beets | — | — | May 4 – Jun 1 | Jul 16 – Jul 30 |
| Potatoes | — | — | May 4 – May 25 | — |
| Swiss Chard | — | — | May 11 – Jun 8 | Jul 16 – Jul 30 |
| Cilantro | — | — | May 11 – Jun 1 | Jul 30 – Aug 20 |
| Green Beans | — | — | Jun 1 – Jun 22 | Jul 9 – Jul 23 |
| Sweet Corn | — | — | Jun 1 – Jun 15 | — |
| Sweet Potatoes | — | Jun 8 – Jun 29 | — | — |
| Garlic | — | — | — | Sep 10 – Oct 15 |
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 First Connecticut Lake, NH weather station, 6 km away (elevation 1,650 ft (503 m)).
Frost dates near Pittsburg
- Colebrook May 31 · Sep 21
- Errol May 21 · Sep 22
- Mount Washington May 19 · Sep 29
- West Stewartstown May 19 · Sep 29
- North Stratford May 19 · Sep 29
- Groveton May 19 · Sep 29
- Milan May 30 · Sep 19
- Lancaster May 18 · Sep 30
- Berlin May 14 · Sep 30
- Jefferson May 8 · Oct 1
Frequently asked questions
When is the last frost in Pittsburg, NH?
The median last spring frost in Pittsburg, NH is May 25. There is still about a 10% chance of frost after June 8, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Pittsburg, NH?
The median first fall frost is September 24, with about a 10% chance of frost before September 9.
How long is the growing season in Pittsburg, NH?
About 122 days between the median last spring frost and first fall frost.
What planting zone is Pittsburg, NH?
Pittsburg, NH is in USDA hardiness zone 4a.