When is the last frost in Alpharetta, GA?

The average last spring frost (50% probability of 32°F) in Alpharetta is around April 4, based on NOAA/NCEI 1991–2020 normals at the Cumming 2n, GA station (11 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Alpharetta?

The average first fall frost in Alpharetta, GA is around November 4, giving roughly a 214-day frost-free growing season.

What planting zone is Alpharetta, GA?

Alpharetta is in USDA plant hardiness zone 8a (average annual extreme minimum temperature 10 to 15°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Alpharetta?

In Alpharetta, GA the warmest month is July (avg high 88.8°F) and the coldest is January (avg low 31.1°F). It averages about 56.4″ of precipitation a year and 0.6″ of snow.

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Alpharetta, GA Planting Calendar & Frost Dates

USDA hardiness zone 8a · ZIP 30004 · elevation 348′ · NOAA & USDA data

Alpharetta is in USDA hardiness zone 8a (winters can dip to 10 to 15°F), with a growing season of about 214 days between the average last spring frost (April 4) and first fall frost (November 4). The warmest month is July (avg high 88.8°F); the coldest is January (avg low 31.1°F). It averages 56.4″ of precipitation a year and 0.6″ of snow, mostly mid-winter. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 10 to 15°F

Last spring frost

April 4

avg (50% prob, 32°F)

First fall frost

November 4

avg (50% prob, 32°F)

Growing season

214 days

frost-free window

Warmest month

July

avg high 88.8°F

Month-by-month typical weather in Alpharetta

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Cumming 2n, GA (11 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	51.2	31.1	41.2	5.4	0.1
February	55.9	33.3	44.6	5.2	0.2
March	63	39.8	51.4	5.2	0.3
April	72.1	46.3	59.2	4.3	0
May	79.3	55.5	67.4	4.2	0
June	85.4	63.8	74.6	4.7	0
July	88.8	67.4	78.1	4.9	0
August	88	66.9	77.5	4.9	0
September	82.3	60	71.2	4	0
October	73.3	48.8	61	4	0
November	63	38.8	50.9	4.4	0
December	54.3	33.9	44.1	5.2	0

What to plant when in Alpharetta

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: February 21 · Transplant out: April 11
Peppers	warm	Start seeds indoors: February 7 · Transplant out: April 18
Cucumbers	warm	Direct sow: April 11
Zucchini / squash	warm	Direct sow: April 11
Bush beans	warm	Direct sow: April 11
Sweet corn	warm	Direct sow: April 11
Basil	warm	Transplant out: April 11
Peas	cool	Sow (spring): February 28 · Sow (fall): September 9
Spinach	cool	Sow (spring): February 21 · Sow (fall): September 9
Lettuce	cool	Sow (spring): March 7 · Sow (fall): September 9
Kale	cool	Transplant (spring): March 14 · Sow (fall): August 26
Broccoli	cool	Transplant (spring): March 21
Carrots	cool	Sow (spring): March 14 · Sow (fall): August 26
Onions	cool	Transplant (spring): March 7
Potatoes	cool	Plant seed potatoes: March 21
Radishes	cool	Sow (spring): March 7 · Sow (fall): September 23

Dates are computed from Alpharetta's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in Georgia

Roswell, GA Smyrna, GA Marietta, GA Atlanta, GA Macon, GA Warner Robins, GA Columbus, GA Albany, GA

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — Cumming 2n, GA, 11 mi (confidence: medium). Monthly weather normals: Cumming 2n, GA, 11 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.