Frost dates / Georgia / Alpharetta
Frost dates in Alpharetta, GA
The station on this page is ATLANTA PEACHTREE AP, GA US (USW00053863), 13.6 miles from the city point. Population in the Census 2024 estimate is 67,275.
Zone 8aUSDA average annual extreme minimum 10°F to 15°F, from ZIP 30009 (1.8 miles from the city point used on this page).
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Last 32°F in spring
NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.
| Probability | Date | How to read it |
|---|---|---|
| 90% | March 5 | Earlier date. A last 32°F on or after this day is common. |
| 50% | March 25 | Median. |
| 10% | April 12 | Later date. A last 32°F on or after this day is uncommon. |
First 32°F in fall
NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.
| Probability | Date | How to read it |
|---|---|---|
| 10% | October 26 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | November 9 | Median. |
| 90% | November 27 | Later date. A first 32°F on or before this day is common. |
32°F growing-season length
Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.
| Probability the season is at least this long | Days |
|---|---|
| 10% | 253 |
| 50% | 228 |
| 90% | 205 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | March 31 | March 12 | February 18 |
| First, on or before | November 4 | November 22 | December 14 |
| Season at least | 287 days | 256 days | 229 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 22 | April 7 | March 21 |
| First, on or before | October 17 | October 29 | November 12 |
| Season at least | 225 days | 205 days | 185 days |
Station ATLANTA PEACHTREE AP, GA US (USW00053863). Completeness flag R, 20 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 305.4 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.
Planting calendar for Alpharetta · Zone 8a
Check a crop against this station
Alpharetta, GA
Zone 8aAverage annual extreme minimum 10°F to 15°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Georgia. Nearest qualified station: ATLANTA PEACHTREE AP, GA US (USW00053863), 13.6 miles. Median last 32°F March 25. Median first 32°F November 9. The 50% growing-season length is 228 days.
Open the ZIP page · Crop guides for Georgia
32°F probabilities at this station
| 10% | 50% | 90% | |
|---|---|---|---|
| Last 32°F on or after | April 12 | March 25 | March 5 |
| First 32°F on or before | October 26 | November 9 | November 27 |
Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.
Planting calendar
Windows below are from UGA Cooperative Extension, Vegetable Gardening in Georgia, Circular 963, retrieved 2026-10-10. Circular 963, revised June 2023, prints one vegetable planting chart for the state. It does not give separate dates for North, Middle, and South Georgia. Where several cultivar rows share a crop name, the page uses the dates those rows print in common and names the row when a date differs.
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