Stamford, CT planting zone & frost dates
Stamford is in USDA hardiness zone 7a. The last spring frost usually comes around April 17 and the first fall frost around October 23, for a growing season of about 188 days.
Planting calendar for Stamford
Dates are counted from the average last spring frost (April 17) 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 20 – Mar 6 Transplant outdoors: Apr 24 – May 1 |
| Peppers | Start seeds indoors: Feb 6 – Feb 20 Transplant outdoors: May 1 – May 8 |
| Eggplant | Start seeds indoors: Feb 6 – Feb 20 Transplant outdoors: May 1 – May 8 |
| Broccoli | Start seeds indoors: Feb 6 – Feb 20 Transplant outdoors: Mar 20 – Apr 3 |
| Cabbage | Start seeds indoors: Feb 6 – Feb 20 Transplant outdoors: Mar 20 – Apr 3 |
| Onions (sets) | Plant outdoors: Mar 20 – Apr 3 |
| Peas | Sow outdoors: Mar 6 – Mar 20 |
| Spinach | Sow outdoors: Mar 6 – Mar 20 |
| Lettuce | Sow outdoors: Mar 20 – Apr 3 |
| Carrots | Sow outdoors: Mar 20 – Apr 3 |
| Potatoes | Plant outdoors: Mar 20 – Apr 3 |
| Beans | Sow outdoors: Apr 24 – May 1 |
| Sweet corn | Sow outdoors: Apr 24 – May 1 |
| Cucumbers | Sow outdoors: Apr 24 – May 1 |
| Squash & zucchini | Sow outdoors: Apr 24 – May 1 |
| Basil | Start seeds indoors: Mar 6 – Mar 20 Transplant outdoors: Apr 24 – May 1 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 28 (8 weeks before the average first fall frost on Oct 23).
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 3 | Apr 17 | May 2 |
| First 32°F frost in fall is before | Nov 6 | Oct 23 | Oct 8 |
How to read it: in spring there is a 10% chance of a frost after May 2, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 8. A hard freeze (28°F) usually ends around April 3.
Hardiness zone by ZIP code in Stamford
- 06901 zone 7a
- 06902 zone 7a
- 06903 zone 7a
- 06904 zone 7a
- 06905 zone 7a
- 06906 zone 7a
- 06907 zone 7a
- 06910 zone 7a
- 06911 zone 7a
- 06912 zone 7a
- 06913 zone 7a
- 06914 zone 7a
- 06926 zone 7a
- 06927 zone 7a
Nearby cities
- Darien zone 7a, last frost Apr 17
- North Stamford zone 7a, last frost Apr 17
- Greenwich zone 7a, last frost Apr 12
- 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 Stamford, CT?
Stamford 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 Stamford?
The average last spring frost (32°F) in Stamford is April 17. There is still a 10% chance of frost until May 2.
When can I plant tomatoes in Stamford?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 24 – May 1. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Stamford 5 N, CT (USC00067970), 8.0 km (5.0 mi) from the city center, elevation 58 m, based on 22 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.