Old Saybrook, CT planting zone & frost dates
Old Saybrook is in USDA hardiness zone 7a. The last spring frost usually comes around April 6 and the first fall frost around November 17, for a growing season of about 221 days.
Planting calendar for Old Saybrook
Dates are counted from the average last spring frost (April 6) 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 9 – Feb 23 Transplant outdoors: Apr 13 – Apr 20 |
| Peppers | Start seeds indoors: Jan 26 – Feb 9 Transplant outdoors: Apr 20 – Apr 27 |
| Eggplant | Start seeds indoors: Jan 26 – Feb 9 Transplant outdoors: Apr 20 – Apr 27 |
| Broccoli | Start seeds indoors: Jan 26 – Feb 9 Transplant outdoors: Mar 9 – Mar 23 |
| Cabbage | Start seeds indoors: Jan 26 – Feb 9 Transplant outdoors: Mar 9 – Mar 23 |
| Onions (sets) | Plant outdoors: Mar 9 – Mar 23 |
| Peas | Sow outdoors: Feb 23 – Mar 9 |
| Spinach | Sow outdoors: Feb 23 – Mar 9 |
| Lettuce | Sow outdoors: Mar 9 – Mar 23 |
| Carrots | Sow outdoors: Mar 9 – Mar 23 |
| Potatoes | Plant outdoors: Mar 9 – Mar 23 |
| Beans | Sow outdoors: Apr 13 – Apr 20 |
| Sweet corn | Sow outdoors: Apr 13 – Apr 20 |
| Cucumbers | Sow outdoors: Apr 13 – Apr 20 |
| Squash & zucchini | Sow outdoors: Apr 13 – Apr 20 |
| Basil | Start seeds indoors: Feb 23 – Mar 9 Transplant outdoors: Apr 13 – Apr 20 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 22 (8 weeks before the average first fall frost on Nov 17).
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 | Mar 25 | Apr 6 | May 2 |
| First 32°F frost in fall is before | Dec 4 | Nov 17 | Oct 31 |
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 31. A hard freeze (28°F) usually ends around March 25.
Hardiness zone by ZIP code in Old Saybrook
- 06475 zone 7a
Nearby cities
- Madison zone 7a, last frost Apr 17
- Waterford zone 7a, last frost Apr 16
- New London zone 7a, last frost Apr 8
- Montville Center zone 6b, last frost Apr 14
- Guilford zone 7a, last frost Apr 17
- Norwich zone 6b, last frost Apr 14
- Middletown zone 6b, last frost Apr 26
- Ledyard zone 6b, last frost Apr 8
Questions
What growing zone is Old Saybrook, CT?
Old Saybrook 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 Old Saybrook?
The average last spring frost (32°F) in Old Saybrook is April 6. There is still a 10% chance of frost until May 2.
When can I plant tomatoes in Old Saybrook?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 13 – Apr 20. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Orient Pt Sp, NY (USC00306276), 20.3 km (12.6 mi) from the city center, elevation 1 m, based on 3 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.