Claremont, NH planting zone & frost dates
Claremont is in USDA hardiness zone 5b. The last spring frost usually comes around May 14 and the first fall frost around October 1, for a growing season of about 140 days.
Planting calendar for Claremont
Dates are counted from the average last spring frost (May 14) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Mar 19 – Apr 2 Transplant outdoors: May 21 – May 28 |
| Peppers | Start seeds indoors: Mar 5 – Mar 19 Transplant outdoors: May 28 – Jun 4 |
| Eggplant | Start seeds indoors: Mar 5 – Mar 19 Transplant outdoors: May 28 – Jun 4 |
| Broccoli | Start seeds indoors: Mar 5 – Mar 19 Transplant outdoors: Apr 16 – Apr 30 |
| Cabbage | Start seeds indoors: Mar 5 – Mar 19 Transplant outdoors: Apr 16 – Apr 30 |
| Onions (sets) | Plant outdoors: Apr 16 – Apr 30 |
| Peas | Sow outdoors: Apr 2 – Apr 16 |
| Spinach | Sow outdoors: Apr 2 – Apr 16 |
| Lettuce | Sow outdoors: Apr 16 – Apr 30 |
| Carrots | Sow outdoors: Apr 16 – Apr 30 |
| Potatoes | Plant outdoors: Apr 16 – Apr 30 |
| Beans | Sow outdoors: May 21 – May 28 |
| Sweet corn | Sow outdoors: May 21 – May 28 |
| Cucumbers | Sow outdoors: May 21 – May 28 |
| Squash & zucchini | Sow outdoors: May 21 – May 28 |
| Basil | Start seeds indoors: Apr 2 – Apr 16 Transplant outdoors: May 21 – May 28 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 6 (8 weeks before the average first fall frost on Oct 1).
Useful for zone 5b gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
- Cold frame / mini greenhouse — adds weeks to a short season
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 30 | May 14 | May 29 |
| First 32°F frost in fall is before | Oct 12 | Oct 1 | Sep 19 |
How to read it: in spring there is a 10% chance of a frost after May 29, so that is a safe date for tender plants. In fall there is a 10% chance of frost before September 19. A hard freeze (28°F) usually ends around May 1.
Hardiness zone by ZIP code in Claremont
- 03743 zone 5b
Nearby cities
- Lebanon zone 5a, last frost May 9
- Keene zone 5b, last frost May 14
- East Concord zone 5b, last frost May 8
- Concord zone 5b, last frost May 8
- Laconia zone 5b, last frost Apr 30
- Bedford zone 6a, last frost Apr 21
- Manchester zone 6a, last frost Apr 30
- Merrimack zone 6a, last frost Apr 30
Questions
What growing zone is Claremont, NH?
Claremont is in USDA Plant Hardiness Zone 5b (average extreme winter low -15°F to -10°F), according to the USDA 2023 map.
When is the last frost in Claremont?
The average last spring frost (32°F) in Claremont is May 14. There is still a 10% chance of frost until May 29.
When can I plant tomatoes in Claremont?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around May 21 – May 28. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Newport, NH (USC00275868), 13.4 km (8.3 mi) from the city center, elevation 235 m, based on 28 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.