Ledyard, CT planting zone & frost dates
Ledyard is in USDA hardiness zone 6b. The last spring frost usually comes around April 8 and the first fall frost around November 2, for a growing season of about 207 days.
Planting calendar for Ledyard
Dates are counted from the average last spring frost (April 8) 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: Feb 11 – Feb 25 Transplant outdoors: Apr 15 – Apr 22 |
| Peppers | Start seeds indoors: Jan 28 – Feb 11 Transplant outdoors: Apr 22 – Apr 29 |
| Eggplant | Start seeds indoors: Jan 28 – Feb 11 Transplant outdoors: Apr 22 – Apr 29 |
| Broccoli | Start seeds indoors: Jan 28 – Feb 11 Transplant outdoors: Mar 11 – Mar 25 |
| Cabbage | Start seeds indoors: Jan 28 – Feb 11 Transplant outdoors: Mar 11 – Mar 25 |
| Onions (sets) | Plant outdoors: Mar 11 – Mar 25 |
| Peas | Sow outdoors: Feb 25 – Mar 11 |
| Spinach | Sow outdoors: Feb 25 – Mar 11 |
| Lettuce | Sow outdoors: Mar 11 – Mar 25 |
| Carrots | Sow outdoors: Mar 11 – Mar 25 |
| Potatoes | Plant outdoors: Mar 11 – Mar 25 |
| Beans | Sow outdoors: Apr 15 – Apr 22 |
| Sweet corn | Sow outdoors: Apr 15 – Apr 22 |
| Cucumbers | Sow outdoors: Apr 15 – Apr 22 |
| Squash & zucchini | Sow outdoors: Apr 15 – Apr 22 |
| Basil | Start seeds indoors: Feb 25 – Mar 11 Transplant outdoors: Apr 15 – Apr 22 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 7 (8 weeks before the average first fall frost on Nov 2).
Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Mar 28 | Apr 8 | Apr 22 |
| First 32°F frost in fall is before | Nov 15 | Nov 2 | Oct 18 |
How to read it: in spring there is a 10% chance of a frost after April 22, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 18. A hard freeze (28°F) usually ends around March 29.
Hardiness zone by ZIP code in Ledyard
- 06339 zone 6b
Nearby cities
- Norwich zone 6b, last frost Apr 14
- New London zone 7a, last frost Apr 8
- Montville Center zone 6b, last frost Apr 14
- Waterford zone 7a, last frost Apr 16
- Plainfield zone 6b, last frost Apr 30
- Windham zone 6b, last frost Apr 28
- Willimantic zone 6b, last frost Apr 28
- Old Saybrook zone 7a, last frost Apr 6
Questions
What growing zone is Ledyard, CT?
Ledyard is in USDA Plant Hardiness Zone 6b (average extreme winter low -5°F to 0°F), according to the USDA 2023 map.
When is the last frost in Ledyard?
The average last spring frost (32°F) in Ledyard is April 8. There is still a 10% chance of frost until April 22.
When can I plant tomatoes in Ledyard?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 15 – Apr 22. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Groton, CT (USC00063207), 10.1 km (6.3 mi) from the city center, elevation 12 m, based on 24 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.