Griffin, GA planting zone & frost dates
Griffin is in USDA hardiness zone 8b. The last spring frost usually comes around March 20 and the first fall frost around November 13, for a growing season of about 239 days.
Planting calendar for Griffin
Dates are counted from the average last spring frost (March 20) 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: Jan 23 – Feb 6 Transplant outdoors: Mar 27 – Apr 3 |
| Peppers | Start seeds indoors: Jan 9 – Jan 23 Transplant outdoors: Apr 3 – Apr 10 |
| Eggplant | Start seeds indoors: Jan 9 – Jan 23 Transplant outdoors: Apr 3 – Apr 10 |
| Broccoli | Start seeds indoors: Jan 9 – Jan 23 Transplant outdoors: Feb 20 – Mar 6 |
| Cabbage | Start seeds indoors: Jan 9 – Jan 23 Transplant outdoors: Feb 20 – Mar 6 |
| Onions (sets) | Plant outdoors: Feb 20 – Mar 6 |
| Peas | Sow outdoors: Feb 6 – Feb 20 |
| Spinach | Sow outdoors: Feb 6 – Feb 20 |
| Lettuce | Sow outdoors: Feb 20 – Mar 6 |
| Carrots | Sow outdoors: Feb 20 – Mar 6 |
| Potatoes | Plant outdoors: Feb 20 – Mar 6 |
| Beans | Sow outdoors: Mar 27 – Apr 3 |
| Sweet corn | Sow outdoors: Mar 27 – Apr 3 |
| Cucumbers | Sow outdoors: Mar 27 – Apr 3 |
| Squash & zucchini | Sow outdoors: Mar 27 – Apr 3 |
| Basil | Start seeds indoors: Feb 6 – Feb 20 Transplant outdoors: Mar 27 – Apr 3 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Sep 18 (8 weeks before the average first fall frost on Nov 13).
Useful for zone 8b 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 | Feb 25 | Mar 20 | Apr 10 |
| First 32°F frost in fall is before | Dec 3 | Nov 13 | Oct 31 |
How to read it: in spring there is a 10% chance of a frost after April 10, 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 2.
Hardiness zone by ZIP code in Griffin
- 30223 zone 8a
- 30224 zone 8b
Nearby cities
- McDonough zone 8a, last frost Mar 31
- Fayetteville zone 8a, last frost Mar 25
- Stockbridge zone 8a, last frost Mar 25
- Riverdale zone 8b, last frost Mar 15
- Peachtree City zone 8a, last frost Mar 26
- Forest Park zone 8b, last frost Mar 15
- Union City zone 8a, last frost Mar 15
- College Park zone 8b, last frost Mar 15
Questions
What growing zone is Griffin, GA?
Griffin is in USDA Plant Hardiness Zone 8b (average extreme winter low 15°F to 20°F), according to the USDA 2023 map. Some ZIP codes of the city fall in zone 8a.
When is the last frost in Griffin?
The average last spring frost (32°F) in Griffin is March 20. There is still a 10% chance of frost until April 10.
When can I plant tomatoes in Griffin?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Mar 27 – Apr 3. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Experiment, GA (USC00093271), 2.6 km (1.6 mi) from the city center, elevation 285 m, based on 12 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.