Frost dates in Georgia span a wide window because the state stretches from mountain valleys to the Atlantic coast. Based on NOAA’s Atlanta-area station (USW00013874), the last spring freeze typically falls between March 11 and March 29, and the first fall freeze between November 13 and December 1. That’s a reference point, not a guarantee for your specific yard.
The frost dates for Georgia
Those two date ranges come from NOAA’s National Centers for Environmental Information, using the 1991-2020 Climate Normals for station USW00013874, the Atlanta airport site. NOAA doesn’t publish a single “frost day.” Instead it tracks the probability that the temperature will drop to 32°F on any given date, and the range cited here reflects the 30 to 70 percent probability band, meaning there’s a real chance of frost on either side of it, not a hard cutoff.
That distinction matters more than it sounds. A March 11 frost has already happened in some years at this station, and a frost lingering past March 29 has happened too. The 18-day spread in spring and the 18-day spread in fall aren’t rounding errors, they’re the actual year-to-year variability baked into two decades of temperature records.
There’s a second wrinkle specific to this particular station. Atlanta’s airport sits inside an urban heat island, surrounded by tarmac, buildings, and vehicle traffic that hold warmth overnight. That pushes its frost dates later in spring and earlier… no, later in fall, than a rural spot at the same latitude would see. North Georgia and the mountains around towns like Dahlonega or Helen freeze several weeks earlier in fall than this station suggests, while the coastal plain near Savannah or Valdosta runs noticeably milder. If you garden outside the immediate Atlanta metro, treat these dates as a starting point to adjust from, not a local forecast.
Where hardiness zones fit in
Georgia spans USDA Plant Hardiness Zones 6a to 9b, according to the USDA’s 2023 map built on 1991-2020 normals. That’s a completely different measurement from frost dates. The USDA zone system tracks just one variable: the average annual extreme minimum temperature, the coldest night you’d typically expect in a given winter. It says nothing about when your last spring frost lands or how long your growing season runs. A zone number tells you which perennials and shrubs can survive winter in your area. Frost dates tell you when to plant and when to pull in your tomatoes. Both numbers matter, but they answer different questions, and conflating them is a common mistake.
How long the growing season actually is here
Subtract the last spring frost from the first fall frost at this Atlanta-area station and you get a frost-free window running roughly from late March to late November, somewhere in the neighborhood of eight months depending on which end of each range you land on in a given year. That’s a long season by national standards, long enough for two full rounds of many vegetable crops if you plan the calendar right.
But that eight-month figure belongs to one station in one part of the state. Elevation changes everything. The mountain counties in the far north sit at higher altitude and colder average temperatures, which compresses the frost-free window from both ends: spring frost lingers later, fall frost arrives sooner. Gardeners in those counties typically work with a noticeably shorter season than what the Atlanta data implies, even though no specific date range for those stations appears in the NOAA dataset referenced here.
Head the other direction, toward the coastal plain and the immediate coastline near Brunswick or St. Marys, and the pattern reverses. Proximity to the ocean and the Gulf Stream’s moderating influence keeps those areas warmer through what would otherwise be frost season elsewhere in the state, stretching the effective growing window longer at both ends.
This is why a single statewide growing-season number, even a well-sourced one, can mislead more than it helps. Georgia isn’t one climate. It’s a north-to-south gradient stacked on top of an inland-to-coastal gradient, and the eight-month window calculated from the Atlanta station describes conditions closer to the middle of that spread than either extreme. Gardeners in Rabun County and gardeners in Camden County are working from genuinely different calendars, even though both are technically “Georgia gardeners.”
For crops that need the full season to mature (think winter squash or late-maturing dry beans), knowing where your county sits on that gradient matters more than any single statewide average.
Turning these dates into a sowing date
The practical use of a frost date range isn’t marking a single day on the calendar, it’s building in a buffer. For warm-season crops like tomatoes, peppers, squash, and beans, the safer move is to wait until you’re past the later end of the spring window, March 29, before setting transplants outside unprotected. Planting right at March 11 might work in a mild year and might cost you the whole tray in a year that runs true to form.
Cold-hardy crops flip that logic. Lettuce, spinach, peas, and other cool-season vegetables can generally go in the ground near the early end of that spring range, since a light frost won’t set them back the way it would a pepper seedling. Some gardeners push these crops in even earlier under row cover, using the fabric to buy a couple extra weeks against the March 11 to March 29 uncertainty.
Fall planning works in reverse. Count backward from the first fall frost window, November 13 to December 1, to figure out your last safe sowing date for anything that needs to mature before cold weather returns. Seed packets list “days to maturity,” and subtracting that number from November 13, the earlier and more conservative end of the fall range, gives you a cutoff for direct-sown fall crops like beans or summer squash. Crops that tolerate light frost, such as kale, carrots, and beets, have more flexibility and can often keep producing past that window entirely.
Where to check before you commit
None of this replaces local knowledge. The University of Georgia Cooperative Extension Service, part of the federal land-grant Extension network, maintains county-level offices and planting guidance that account for the specific microclimate differences NOAA’s statewide station data can’t capture. Before finalizing a sowing calendar for your county, it’s worth checking UGA Extension for guidance tuned closer to your actual growing conditions.
Why your own garden differs from this figure
The Atlanta airport station sits in an open, paved environment, exactly the kind of setting that produces a heat island effect. Concrete and asphalt absorb heat during the day and release it slowly at night, which delays the first fall freeze and can nudge frost dates later than a rural site nearby would experience. If your property sits well outside a paved, developed area, your actual frost dates may run earlier in fall and possibly later in spring than the Atlanta figures suggest.
Elevation shifts things too, and not always in the direction people expect. Cold air is heavier than warm air, so it flows downhill and pools in low-lying areas on calm, clear nights. A garden at the bottom of a slope or in a valley bottom can see frost on nights when a garden just a few hundred feet upslope stays frost-free, a phenomenon gardeners sometimes call a frost pocket. If you’ve ever noticed one corner of your yard consistently browns off before the rest, that’s likely what’s happening.
Tree canopy and structures add another layer. A garden bed close to a house, fence, or dense tree line often stays a degree or two warmer overnight than an exposed bed in the open, simply because those surfaces block radiant heat loss to the sky. South-facing slopes warm faster in spring than north-facing ones for the same reason sunlight hits them more directly and for longer.
None of these factors are things NOAA’s station-based averages can measure for your specific plot. They’re real, they’re local, and the only way to know how they play out on your property is to track your own frost occurrences over a few seasons, ideally with a simple min-max thermometer placed in the actual bed you’re planning around.
Common questions
What hardiness zone is Atlanta in?
Georgia as a whole spans USDA Zones 6a to 9b, but that’s a statewide range covering everything from the mountains to the coast. Atlanta itself falls toward the middle of that range rather than at either extreme; check the current USDA Plant Hardiness Zone Map for the specific zone tied to your ZIP code rather than relying on the statewide span.
Is it safe to plant tomatoes right after the last frost date?
The last spring frost date for the Atlanta-area station falls somewhere between March 11 and March 29 in a typical year, and that range itself reflects real uncertainty. Planting warm-season crops like tomatoes right at the earliest end of that window carries more risk than waiting until you’re past the later end, especially without row cover or another form of frost protection on hand.
Why does NOAA give a date range instead of one exact frost date?
Because frost timing varies year to year even at the same location. NOAA’s Climate Normals report the range where the probability of a 32°F freeze falls between 30 and 70 percent, based on 1991-2020 temperature records, rather than pinpointing a single day that would falsely imply certainty.
Do coastal areas of Georgia freeze later than north Georgia?
The general pattern runs that way: coastal and southern parts of the state trend milder, while north Georgia and the mountains see frost arrive earlier in fall and linger later in spring. Specific dates for those regions aren’t part of the NOAA dataset cited for this Atlanta-area station, so anyone gardening outside the metro area should treat local Extension guidance as the more reliable source for their exact county.