When to plant in Alpharetta, GA
USDA Zone 8aAlpharetta, Georgia frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Alpharetta's nearest full-normals station sits about 22 km out, so treat these as a close estimate — local microclimate can nudge your first and last frost. In zone 8a, Alpharetta supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
ATLANTA PEACHTREE AP · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Alpharetta’s own odds, recorded at ATLANTA PEACHTREE AP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 22 | Apr 7 | Mar 21 | Oct 17 | Oct 29 | Nov 12 |
| 32°F | Apr 12 | Mar 25 | Mar 5 | Oct 26 | Nov 9 | Nov 27 |
| 28°F | Mar 31 | Mar 12 | Feb 18 | Nov 4 | Nov 22 | Dec 14 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Alpharetta, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 37 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Alpharetta planting FAQ
When is the last spring frost in Alpharetta, GA?
On average, the last spring frost in Alpharetta is around March 25 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Alpharetta, GA?
Expect Alpharetta's first fall frost near November 9 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Alpharetta in?
Alpharetta is in USDA hardiness zone 8a. In zone 8a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Alpharetta?
Alpharetta has about 229 frost-free days — a long growing season — between the average last spring frost (March 25) and first fall frost (November 9).
When should I plant tomatoes in Alpharetta?
For Alpharetta, sow tomatoes indoors about January 28–February 11 and move the seedlings out around April 1, after the last spring frost.
Never miss a window in Alpharetta
An email when it’s time to start seeds, transplant, and sow — timed to Alpharetta’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Johns Creek · 8 km
- Roswell · 8 km
- Milton · 9 km
- Peachtree Corners · 12 km
- Duluth · 14 km
- Dunwoody · 15 km
- Norcross · 16 km
- Sandy Springs · 18 km
Frost dates recorded at ATLANTA PEACHTREE AP, 22 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Alpharetta, GA — Frost Dates & Zone 8a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00053863. Retrieved from https://blissgarden.com/georgia/alpharetta.