Greenwich, CT planting zone & frost dates
Greenwich is in USDA hardiness zone 7a. The last spring frost usually comes around April 12 and the first fall frost around October 31, for a growing season of about 200 days.
Planting calendar for Greenwich
Dates are counted from the average last spring frost (April 12) 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 15 – Mar 1 Transplant outdoors: Apr 19 – Apr 26 |
| Peppers | Start seeds indoors: Feb 1 – Feb 15 Transplant outdoors: Apr 26 – May 3 |
| Eggplant | Start seeds indoors: Feb 1 – Feb 15 Transplant outdoors: Apr 26 – May 3 |
| Broccoli | Start seeds indoors: Feb 1 – Feb 15 Transplant outdoors: Mar 15 – Mar 29 |
| Cabbage | Start seeds indoors: Feb 1 – Feb 15 Transplant outdoors: Mar 15 – Mar 29 |
| Onions (sets) | Plant outdoors: Mar 15 – Mar 29 |
| Peas | Sow outdoors: Mar 1 – Mar 15 |
| Spinach | Sow outdoors: Mar 1 – Mar 15 |
| Lettuce | Sow outdoors: Mar 15 – Mar 29 |
| Carrots | Sow outdoors: Mar 15 – Mar 29 |
| Potatoes | Plant outdoors: Mar 15 – Mar 29 |
| Beans | Sow outdoors: Apr 19 – Apr 26 |
| Sweet corn | Sow outdoors: Apr 19 – Apr 26 |
| Cucumbers | Sow outdoors: Apr 19 – Apr 26 |
| Squash & zucchini | Sow outdoors: Apr 19 – Apr 26 |
| Basil | Start seeds indoors: Mar 1 – Mar 15 Transplant outdoors: Apr 19 – Apr 26 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 5 (8 weeks before the average first fall frost on Oct 31).
Useful for zone 7a 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
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 1 | Apr 12 | Apr 27 |
| First 32°F frost in fall is before | Nov 14 | Oct 31 | Oct 15 |
How to read it: in spring there is a 10% chance of a frost after April 27, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 15. A hard freeze (28°F) usually ends around April 1.
Hardiness zone by ZIP code in Greenwich
- 06830 zone 7a
- 06831 zone 7a
- 06836 zone 7a
Nearby cities
- Stamford zone 7a, last frost Apr 17
- North Stamford zone 7a, last frost Apr 17
- Darien zone 7a, last frost Apr 17
- New Canaan zone 7a, last frost Apr 17
- Norwalk zone 7a, last frost Apr 17
- East Norwalk zone 7a, last frost Apr 17
- Wilton zone 7a, last frost Apr 17
- Westport zone 7a, last frost Apr 17
Questions
What growing zone is Greenwich, CT?
Greenwich is in USDA Plant Hardiness Zone 7a (average extreme winter low 0°F to 5°F), according to the USDA 2023 map.
When is the last frost in Greenwich?
The average last spring frost (32°F) in Greenwich is April 12. There is still a 10% chance of frost until April 27.
When can I plant tomatoes in Greenwich?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 19 – Apr 26. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Westchester Co Ap, NY (USW00094745), 8.0 km (5.0 mi) from the city center, elevation 116 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.