Atlanta Growing Zone Guide

What zone is Atlanta, Georgia?

Atlanta, Georgia, is in USDA Plant Hardiness Zone 7b. That designation means the average annual extreme minimum temperature ranges from 5°F to 10°F — the coldest night of a typical winter, not the average low. Zone 7b places Atlanta in the same hardiness class as parts of middle Tennessee, central North Carolina, and the Ozark region of Arkansas.

The USDA Plant Hardiness Zone Map, last updated in 2023, shows Zone 7b covering most of the Atlanta metro core — Fulton County, DeKalb County, and the majority of Gwinnett, Cobb, and Clayton counties. The zone boundary shifts in the northern suburbs: Cherokee County and Pickens County, at higher elevation, often fall into Zone 7a (0°F to 5°F average minimum), while low-elevation areas south of the city in Henry and Fayette counties may approach Zone 8a.

Elevation drives this variation. Atlanta sits at approximately 1,050 feet above sea level — high for a city this far south. That elevation shaves roughly one zone off what the latitude alone would suggest. Cities at similar latitude but lower elevation, such as Savannah, Georgia (50 feet elevation), are Zone 8b. Atlanta is Zone 7b not because it’s unusually cold for Georgia, but because it’s unusually high.

What Zone 7b means in practice: Most ornamental plants labeled “Zone 7 or warmer” survive Atlanta winters without protection. Plants labeled “Zone 8” may survive most winters but are vulnerable in cold outlier years — Atlanta occasionally dips below 10°F in severe winters, which can kill marginally hardy plants. Zone 6 plants — those requiring colder winters — do not thrive in Atlanta because winters are too mild.

For a complete guide to understanding USDA zone numbers and what they mean for plant selection, see planting zones and USDA zones.

Atlanta frost dates and growing season length

Atlanta’s average last spring frost falls around March 15. The average first fall frost comes around November 15. That window gives Atlanta gardeners approximately 245 frost-free days — about 8 months of growing season, one of the longest in the continental US outside of the Deep South coastal regions and the Southwest.

These are averages, not guarantees. Atlanta winter can vary dramatically year to year. In warm winters, frost may not occur at all in December and January — fig trees flush new growth in February. In severe winters, temperatures can drop to the single digits and freeze even crape myrtles to the ground (they recover from roots).

Practical planting windows based on frost dates:

• Tender warm-season crops (tomatoes, peppers, eggplant): plant outdoors after March 15–April 1, when overnight temps reliably stay above 45°F
• Hardy cool-season crops (kale, broccoli, lettuce, spinach): plant February 1–March 15 for spring production; August 15–September 30 for fall
• Direct-sow warm-season crops (beans, squash, cucumbers): sow after soil reaches 60°F, typically April 1–15
• Frost-tolerant spring bulbs (tulips, daffodils): plant October 15–December 1

For details on finding frost dates by zip code across the Atlanta metro, see last frost date by zip code or when is the last frost.

Atlanta planting calendar

Zone 7b’s long season allows for three distinct planting windows in Atlanta: a cool-season spring window, a warm-season summer window, and a cool-season fall window.

The tomato timing challenge: Atlanta’s spring starts early enough for a long tomato season, but summer heat — often exceeding 95°F from July through August — shuts down fruit set on standard varieties. Plant tomatoes early (March 15–April 1) so they’re producing before the hottest weeks. Choose heat-tolerant varieties such as ‘Celebrity’, ‘Solar Fire’, ‘Sweet 100’ cherry, or ‘Juliet’ for the best summer performance. For tomato companion strategies, see summer vegetables.

Trees and shrubs for Zone 7b Atlanta

Atlanta’s Zone 7b winters are mild enough for a wide range of ornamental trees and shrubs that fail farther north. The combination of Zone 7b cold hardiness and Zone 8 summer heat creates conditions that suit many Southeast-native and East Asian plants perfectly.

For detailed care guides on two of the most iconic Atlanta plants, see azalea and dogwood tree.

Fig trees in Atlanta: Zone 7b is the northern edge of reliable outdoor fig production, and Atlanta sits comfortably within that range. Established fig trees in Atlanta produce without any winter protection in typical years. In severe winters (rare in Atlanta), canes may die back but the root survives and regrows. For growing details, see fig tree.

Vegetables in Atlanta’s two-season system

Atlanta’s Zone 7b climate supports a two-season vegetable garden unlike anything possible in Zone 6. The combination of a March 15 last frost and a November 15 first frost creates a spring season and a fall season separated by a hot-weather gap that favors heat-adapted crops.

Spring season (February–June)

The spring vegetable season in Atlanta starts earlier than most US gardeners expect. Cool-season crops — lettuce, spinach, kale, broccoli, peas — go in February and produce before summer heat ends them in May. Warm-season crops — tomatoes, peppers, squash — go in from mid-March through April.

Spring crop calendar:

• February 1–15: Direct sow spinach, lettuce, kale, Swiss chard outdoors
• March 1–15: Transplant broccoli, cabbage, cauliflower outdoors; direct sow snow peas
• March 15–April 1: Transplant tomatoes, peppers, eggplant
• April 1–15: Direct sow beans, squash, cucumbers, corn when soil reaches 60°F
• May: Plant sweet potato slips, okra seed

Summer gap (July–August)

July is Atlanta’s hardest month for vegetable gardening. Temperatures above 90°F are routine; nights rarely cool below 70°F. This heat shuts down tomato fruit set and encourages disease. Most Atlanta vegetable gardeners:

• Maintain existing plantings but don’t start new ones in July
• Focus on okra, sweet potatoes, and Southern peas — all of which thrive in Atlanta’s summer heat
• Start fall transplants (broccoli, kale) indoors in mid-July for transplanting in August

Fall season (August–November)

The fall vegetable season is Atlanta’s best-kept gardening secret. Starting in mid-August, gardeners replant cool-season crops that thrive through November and often December without frost protection. Kale and collards planted in September harvest through January.

Fall crop calendar:

• August 1–15: Start broccoli, cauliflower, cabbage transplants indoors
• August 15–September 1: Transplant fall broccoli, cabbage, and cauliflower outdoors
• September 1–15: Direct sow kale, collards, turnips, spinach, lettuce
• September 15–October 1: Direct sow carrots, beets, radishes
• October: Plant garlic cloves for harvest next June; direct sow spinach under row cover
• November–December: Harvest kale, collards, turnips; plant bare-root strawberries

Atlanta’s summer heat: AHS Zone 8

Zone 7b tells you what Atlanta winters do to plants. AHS Heat Zone 8 tells you what Atlanta summers do. Both matter when choosing plants.

The American Horticultural Society Heat Zone Map rates regions by the number of days per year with temperatures above 86°F — the point at which many plants begin heat stress. Atlanta is AHS Zone 8, meaning 60–90 days annually above 86°F. That is more heat stress than Zone 7 plants from the Pacific Northwest or northern Europe are adapted to handle.

Heat zone implications for Atlanta gardeners:

• Tomatoes: Choose varieties rated for heat tolerance. Fruit set drops sharply when nighttime temperatures stay above 75°F — common in Atlanta from June through August. Heat-set varieties like ‘Solar Fire’, ‘Heatmaster’, and ‘Celebrity’ continue setting fruit in conditions that stop others cold.
• Cool-season crops in spring: Lettuce, spinach, and broccoli planted in February must be harvested before June — Atlanta’s heat ends them quickly. Time spring cool-season crops to finish before Memorial Day.
• Perennials: Many Zone 7b-rated plants from cooler regions struggle in Atlanta’s summer heat even if they survive the winter. Look for plants with both Zone 7 cold hardiness and documented Southeast or mid-Atlantic garden performance.
• Annual flowers: Standard impatiens collapse in Atlanta’s summer heat and humidity. Replace them with heat-tolerant alternatives: vinca (periwinkle), pentas, ornamental sweet potato vine, celosia, and begonia varieties bred for heat and sun.

What Zone 7b does not support in Atlanta

Not every Zone 7b plant from the USDA map catalog thrives in Atlanta. The combination of heat, humidity, and subtropical disease pressure eliminates some options that grow well in Zone 7b areas with cooler summers.

Choosing plants for Zone 7b Atlanta

When selecting plants for Atlanta, look for varieties and species that are proven performers in comparable climates: the Piedmont region, Upstate South Carolina, central North Carolina, and middle Tennessee (Nashville is Zone 6b, one step colder). If a plant performs well in those areas and is rated to Zone 7, it almost certainly succeeds in Atlanta.

Reliable sources for Zone 7b Atlanta plant performance:

• The Georgia Master Gardener Extension Program (caes.uga.edu/extension/) publishes Atlanta-specific variety trial data for vegetables and ornamentals
• Atlanta Botanical Garden’s plant sale lists reflect what actually thrives in the metro — their selections are screened for local performance

The University of Georgia Cooperative Extension publishes free downloadable guides on vegetable gardening in Georgia, including zone-specific timing calendars at extension.uga.edu — the most accurate resource for Atlanta-area gardeners on planting windows and variety selection.

Resource: University of Georgia Cooperative Extension publishes “Home Vegetable Gardening in Georgia” — a free guide with Atlanta-specific planting schedules, variety recommendations, and zone-by-county guidance, available at extension.uga.edu.