Frost dates by ZIP code: The nearest NOAA stations to your ZIP, 1991-2020 normals
Enter a five-digit ZIP code. PlainClimate finds its center (Census Bureau 2024) and the five nearest NOAA stations with frost dates, and shows each station's last spring and first autumn 32°F dates with its distance and elevation.
Frost dates near ZIP 31217
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 31217 in zone 8b (the coldest night of a typical year: 15 to 20°F).
The nearest station, Macon, GA, is 14 miles from the ZIP's center: its last spring frost comes after March 21 in half of years and after April 7 in one year in ten. By the USDA's method its plant hardiness zone is 8b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Macon, GAMacon Middle Ga Regional Airport | 14 mi | 343 ft | March 21 | April 7 | November 10 | 8b |
| Irwinton, GA4 mi WNW | 15 mi | 515 ft | March 12 | April 1 | November 19 | – |
| Warner Robins, GA | 18 mi | 420 ft | March 11 | March 31 | November 19 | 8b |
| Milledgeville, GA | 22 mi | 368 ft | March 25 | April 9 | November 9 | 8b |
| Monticello, GA | 36 mi | 518 ft | April 4 | April 20 | November 1 | 8a |
Frost comes later in spring at higher and colder stations and earlier in low, open ground: prefer a station at a similar elevation to yours. Hardiness zone in the table: the USDA's rule (the average of each year's coldest night, 1991-2020) applied to the station's own record.
Every frost threshold at Macon
NOAA publishes the dates for several temperatures and odds. A 30% spring date means a 3-in-10 chance of a later frost (the convention almanacs use); 50% is the median; 10% the cautious date.
| Threshold | Spring, 10% | Spring, 30% | Spring, 50% | Spring, 90% | Autumn, 50% | Autumn, 10% |
|---|---|---|---|---|---|---|
| 36°F (light frost) | April 19 | April 10 | April 3 | March 17 | November 1 | October 20 |
| 32°F | April 7 | March 29 | March 21 | February 28 | November 10 | October 29 |
| 28°F (hard freeze) | March 24 | March 13 | March 3 | February 5 | November 24 | November 6 |
| 24°F | March 12 | February 25 | February 14 | January 18 | December 15 | November 18 |
Source: NOAA NCEI 1991-2020 annual normals; ZIP centers: Census Bureau 2024 Gazetteer; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. Autumn 10%: one year in ten has its first frost before this date.