Madison, CT planting zone & frost dates
Madison is in USDA hardiness zone 7a. The last spring frost usually comes around April 17 and the first fall frost around October 27, for a growing season of about 193 days.
Planting calendar for Madison
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 Sep 1 (8 weeks before the average first fall frost on Oct 27).
Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 2 | Apr 17 | May 1 |
| First 32°F frost in fall is before | Nov 8 | Oct 27 | Oct 11 |
How to read it: in spring there is a 10% chance of a frost after May 1, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 11. A hard freeze (28°F) usually ends around April 4.
Hardiness zone by ZIP code in Madison
- 06443 zone 7a
Nearby cities
- Guilford zone 7a, last frost Apr 17
- North Branford zone 7a, last frost Apr 17
- Branford zone 7a, last frost Apr 17
- Old Saybrook zone 7a, last frost Apr 6
- East Haven zone 7a, last frost Apr 17
- Wallingford Center zone 6b, last frost Apr 26
- North Haven zone 6b, last frost Apr 18
- Wallingford zone 6b, last frost Apr 26
Questions
What growing zone is Madison, CT?
Madison 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 Madison?
The average last spring frost (32°F) in Madison is April 17. There is still a 10% chance of frost until May 1.
When can I plant tomatoes in Madison?
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 New Haven Tweed Ap, CT (USW00014758), 24.2 km (15.0 mi) from the city center, elevation 1 m, based on 19 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.