When to plant in Suwanee, GA
USDA Zone 8aEverything below — frost dates, hardiness zone, and what to plant when in Suwanee, Georgia — is derived from the closest NOAA station with complete climate normals.
These dates come from a station roughly 21 km away, the closest with full normals; terrain around Suwanee (elevation, water, pavement) can move your real frost dates a few days either way. Zone 8a means many perennials and even some tender shrubs overwinter in Suwanee, while your frost dates still decide when annuals go out.
Frost probability
CUMMING 2N · 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 Suwanee’s own odds, recorded at CUMMING 2N.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 30 | Apr 16 | Apr 1 | Oct 11 | Oct 25 | Nov 7 |
| 32°F | Apr 19 | Apr 4 | Mar 16 | Oct 23 | Nov 4 | Nov 23 |
| 28°F | Apr 7 | Mar 20 | Feb 26 | Nov 1 | Nov 15 | Dec 5 |
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 Suwanee, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 33 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.
Suwanee planting FAQ
When is the last spring frost in Suwanee, GA?
Suwanee's average last spring frost falls near April 4 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Suwanee, GA?
Expect Suwanee's first fall frost near November 4 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Suwanee in?
Suwanee is in USDA hardiness zone 8a. In zone 8a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Suwanee?
There are roughly 214 frost-free days in Suwanee (a long growing season), running from the average last frost around April 4 to the first fall frost near November 4.
When should I plant tomatoes in Suwanee?
In Suwanee, start tomato seeds indoors around February 7–February 21, then transplant seedlings outdoors around April 11 once the danger of frost has passed.
Never miss a window in Suwanee
An email when it’s time to start seeds, transplant, and sow — timed to Suwanee’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Sugar Hill · 5 km
- Duluth · 10 km
- Buford · 10 km
- Lawrenceville · 13 km
- Johns Creek · 13 km
- Peachtree Corners · 18 km
- Norcross · 18 km
- Lilburn · 19 km
Frost dates recorded at CUMMING 2N, 21 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 Suwanee, GA — Frost Dates & Zone 8a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00092408. Retrieved from https://blissgarden.com/georgia/suwanee.