Saint Simon Mills, GA planting zone & frost dates
Saint Simon Mills is in USDA hardiness zone 9a. The last spring frost usually comes around February 9 and the first fall frost around December 26, for a growing season of about 312 days.
Planting calendar for Saint Simon Mills
Dates are counted from the average last spring frost (February 9) 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: Dec 15 – Dec 29 Transplant outdoors: Feb 16 – Feb 23 |
| Peppers | Start seeds indoors: Dec 1 – Dec 15 Transplant outdoors: Feb 23 – Mar 2 |
| Eggplant | Start seeds indoors: Dec 1 – Dec 15 Transplant outdoors: Feb 23 – Mar 2 |
| Broccoli | Start seeds indoors: Dec 1 – Dec 15 Transplant outdoors: Jan 12 – Jan 26 |
| Cabbage | Start seeds indoors: Dec 1 – Dec 15 Transplant outdoors: Jan 12 – Jan 26 |
| Onions (sets) | Plant outdoors: Jan 12 – Jan 26 |
| Peas | Sow outdoors: Dec 29 – Jan 12 |
| Spinach | Sow outdoors: Dec 29 – Jan 12 |
| Lettuce | Sow outdoors: Jan 12 – Jan 26 |
| Carrots | Sow outdoors: Jan 12 – Jan 26 |
| Potatoes | Plant outdoors: Jan 12 – Jan 26 |
| Beans | Sow outdoors: Feb 16 – Feb 23 |
| Sweet corn | Sow outdoors: Feb 16 – Feb 23 |
| Cucumbers | Sow outdoors: Feb 16 – Feb 23 |
| Squash & zucchini | Sow outdoors: Feb 16 – Feb 23 |
| Basil | Start seeds indoors: Dec 29 – Jan 12 Transplant outdoors: Feb 16 – Feb 23 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Oct 31 (8 weeks before the average first fall frost on Dec 26).
Useful for zone 9a 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
- Shade cloth — for hot summers
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Jan 11 | Feb 9 | Mar 6 |
| First 32°F frost in fall is before | Jan 19 | Dec 26 | Nov 30 |
How to read it: in spring there is a 10% chance of a frost after March 6, so that is a safe date for tender plants. In fall there is a 10% chance of frost before November 30. A hard freeze (28°F) usually ends around January 27.
Nearby cities
- Saint Simons Island zone 9a, last frost Feb 9
- Brunswick zone 9a, last frost Feb 8
- St. Marys zone 9a, last frost Feb 2
- Kingsland zone 9a, last frost Mar 14
- Hinesville zone 9a, last frost Mar 5
- Richmond Hill zone 9a, last frost Mar 2
- Georgetown zone 9a, last frost Mar 2
- Wilmington Island zone 9a, last frost Mar 2
Questions
What growing zone is Saint Simon Mills, GA?
Saint Simon Mills is in USDA Plant Hardiness Zone 9a (average extreme winter low 20°F to 25°F), according to the USDA 2023 map.
When is the last frost in Saint Simon Mills?
The average last spring frost (32°F) in Saint Simon Mills is February 9. There is still a 10% chance of frost until March 6.
When can I plant tomatoes in Saint Simon Mills?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Feb 16 – Feb 23. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Brunswick Malcolm Mckinnon Ap, GA (USW00013878), 2.6 km (1.6 mi) from the city center, elevation 5 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.