Frost dates for 31042Irwinton, GA
The average last spring frost in Irwinton is March 12 and the average first fall frost is November 19, giving a typical growing season of about 255 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 12
- Average first fall frost
- Nov 19
- Growing season
- 255 days
Safer after Apr 1 (1-in-10 risk)
Possible by Nov 3 (1-in-10 risk)
First frost typically in 16 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Mar 5 · Mar 29 · Apr 12 | Oct 25 · Nov 6 · Nov 25 | 226 days | 100% |
| Frost / freeze (32°F) | Feb 18 · Mar 12 · Apr 1 | Nov 3 · Nov 19 · Dec 15 | 255 days | 100% |
| Hard freeze (28°F) | Jan 29 · Feb 25 · Mar 18 | Nov 12 · Dec 4 · Jan 6 | 285 days | 100% |
Planting calendar for Irwinton
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Feb 9 – Apr 17 |
| Tomatoes | Transplant outdoors | Mar 28 – Jul 30 |
| Peppers | Start seeds indoors | Feb 9 – Mar 12 |
| Peppers | Transplant outdoors | Apr 11 – May 12 |
| Eggplant | Start seeds indoors | Feb 26 – Mar 27 |
| Eggplant | Transplant outdoors | Apr 11 – May 12 |
| Cucumbers | Sow outdoors | Apr 11 – Aug 9 |
| Summer squash | Sow outdoors | Mar 28 – May 12 |
| Winter squash & pumpkins | Sow outdoors | Apr 11 – May 12 |
| Snap beans | Sow outdoors | Mar 28 – Sep 1 |
| Sweet corn | Sow outdoors | Mar 28 – Jul 30 |
| Watermelon & cantaloupe | Sow outdoors | Apr 11 – May 12 |
| Okra | Sow outdoors | Apr 4 – Apr 27 |
| Peas | Sow outdoors (spring) | Feb 9 – Mar 27 |
| Potatoes | Plant outdoors (spring) | Feb 9 – Apr 11 |
| Onions | Start seeds indoors (spring) | Dec 29 – Jan 25 |
| Onions | Transplant outdoors (spring) | Feb 26 – Mar 27 |
| Broccoli | Start seeds indoors (spring) | Jan 22 – Feb 25 |
| Broccoli | Transplant outdoors (spring) | Feb 26 – Mar 27 |
| Broccoli | Start seeds indoors (fall) | Jul 20 – Jul 30 |
| Broccoli | Transplant outdoors (fall) | Aug 19 – Aug 30 |
| Cabbage | Start seeds indoors (spring) | Jan 12 – Feb 9 |
| Cabbage | Transplant outdoors (spring) | Feb 9 – Mar 12 |
| Cabbage | Start seeds indoors (fall) | Jul 10 – Aug 9 |
| Cabbage | Transplant outdoors (fall) | Aug 9 – Sep 9 |
| Leaf lettuce | Sow outdoors (spring) | Feb 9 – Apr 27 |
| Leaf lettuce | Sow outdoors (fall) | Aug 9 – Sep 25 |
| Spinach | Sow outdoors (spring) | Feb 2 – Mar 18 |
| Spinach | Sow outdoors (fall) | Aug 26 – Sep 30 |
| Radishes | Sow outdoors (spring) | Feb 9 – Apr 1 |
| Radishes | Sow outdoors (fall) | Aug 9 – Oct 10 |
| Kale | Sow outdoors (spring) | Feb 26 – Mar 18 |
| Kale | Sow outdoors (fall) | Aug 2 – Sep 9 |
| Carrots | Sow outdoors (spring) | Mar 12 – Apr 27 |
| Carrots | Sow outdoors (fall) | Jul 10 – Aug 25 |
| Garlic | Plant outdoors (fall) | Nov 9 – Dec 10 |
Where these dates come from
ZIP code 31042 is matched to the NOAA station Irwinton 4 Wnw, GA, 6.5 km away, at 515 ft elevation (92 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Irwinton 4 Wnw, GA (used) | 515 ft | Mar 12 | Nov 19 |
| Milledgeville, GA | 368 ft | Mar 25 | Nov 9 |
| Dublin, GA | 230 ft | Mar 14 | Nov 13 |
| Dublin 2, GA | 200 ft | Mar 14 | Nov 16 |
Frost dates near Irwinton
- Mc Intyre, GA 31054 · last Mar 12, first Nov 19
- Toomsboro, GA 31090 · last Mar 12, first Nov 19
- Gordon, GA 31031 · last Mar 12, first Nov 19
- Jeffersonville, GA 31044 · last Mar 12, first Nov 19
- Oconee, GA 31067 · last Mar 19, first Nov 13
- Allentown, GA 31003 · last Mar 12, first Nov 19
- Danville, GA 31017 · last Mar 12, first Nov 19
- Hardwick, GA 31034 · last Mar 25, first Nov 9
Frequently asked questions
- When is the last frost in Irwinton, GA?
- For ZIP code 31042, the average last spring frost (32°F) is March 12, based on NOAA 1991-2020 climate normals for the Irwinton 4 Wnw, GA weather station. There is a 1-in-10 chance of a frost after April 1.
- When is the first frost in Irwinton, GA?
- The average first fall frost (32°F) is November 19. There is a 1-in-10 chance of frost by November 3, so tender plants are at risk from that point on.
- How long is the growing season in 31042?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 255 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.