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Frost dates and planting calendar for Aiken, South Carolina

Updated October 30, 2026. Based on USDA, NOAA and Colorado State University Extension data. Published by Humblebee.

USDA hardiness zone
8b[1]
Median last spring frost
Mar 21[2]
Median first fall frost
Nov 7[3]
Growing season, median
232 days[4]

Aiken, South Carolina is in USDA hardiness zone 8b[1]. The median last spring frost is March 21, which means a last frost after that date in half of years[2].

Frost dates

JanFebMarAprMayJunJulAugSepOctNovDecLast spring frost: 9 in 10 years after Mar 2, half of years Mar 21, 1 in 10 years after Apr 6Last frostmedian Mar 21First fall frost: 9 in 10 years before Nov 24, half of years Nov 7, 1 in 10 years before Oct 25First frostmedian Nov 7Frost riskHardyHardy vegetables: plant Feb 21 to Mar 7Feb 21 to Mar 7Semi-hardySemi-hardy vegetables: plant Mar 7 to Mar 21Mar 7 to Mar 21TenderTender vegetables: plant around Mar 21around Mar 21Very tenderVery tender vegetables: plant from Apr 4from Apr 4
Shaded: the span between the dates frost passes in 9 of 10 years and 1 of 10 years[2][3]. Green: planting windows from the CSU rules applied to the median last frost (GardenFacts calculation)[6]. Exact dates are in the tables below.

In half of years the last spring frost at this station comes after March 21, and in 1 of 10 years it comes after April 6[2]. In 9 of 10 years it comes after March 2[2]. The first fall frost comes before November 7 in half of years, and before October 25 in 1 of 10 years[3]. These are odds from 1991 to 2020 records, not a forecast. They come from the NOAA Aiken 5SE weather station[5].

Frost Likely (9 in 10 years) Even odds (5 in 10) Unlikely (1 in 10)
Last spring frost (32°F)[2] after March 2 after March 21 after April 6
First fall frost (32°F)[3] before October 25 before November 7 before November 24
  • Hard freeze (28°F): median last spring date March 9, median first fall date November 19[7].
  • Frost-free growing season: at least 208 days in 9 of 10 years, 232 days in half of years and 259 days in 1 of 10 years[4].
  • The low reached 32°F or colder in 100% of years and 28°F or colder in 100% of years[8].
  • Weather station: Aiken 5SE (USC00380074), 3.2 miles from the city center, 492 feet, 16 years of 1991 to 2020 records[5].

When to plant vegetables

Colorado State University Extension wrote its planting guide for Colorado, so Aiken's dates here are simple calculations from it[6]. CSU says hardy vegetables such as broccoli, lettuce and spinach can go in as early as 2 to 4 weeks before the average last spring frost, which works out to February 21 to March 7 in Aiken[6]. Semi-hardy vegetables such as carrots and potatoes can go in as early as 2 weeks before it, from March 7 up to the median date itself[9]. Tender vegetables such as snap beans and sweet corn can be seeded around March 21[10]. Very tender vegetables such as tomatoes and peppers typically wait 2 or more weeks after the last frost, so the earliest start is April 4[11].

  • Hardy (broccoli, cabbage, kohlrabi, lettuce, onions, peas, radishes, spinach, turnips): as early as 2 to 4 weeks before the median last frost (March 21) is February 21 to March 7[6]
  • Semi-hardy (beets, carrots, cauliflower, parsnips, potatoes, Swiss chard): as early as 2 weeks before the median last frost (March 21) is March 7, up to the median date itself[9]
  • Tender (snap beans, sweet corn, cucumbers, summer squash): from seed around the median last frost date, March 21[10]
  • Very tender (cantaloupe, eggplant, peppers, tomatoes, winter squash, watermelon): the earliest start, two weeks after the median last frost (March 21), is April 4[11]
Vegetable (CSU group) Plant from First harvest around
Broccoli (hardy)[12] Feb 21 Apr 27 (from transplants)
Cabbage (hardy)[12] Feb 21 May 17 (from transplants)
Kohlrabi (hardy)[12] Feb 21 Apr 12
Lettuce (hardy)[12] Feb 21 Apr 22
Onions (hardy)[12] Feb 21 Jun 11
Peas (hardy)[12] Feb 21 Apr 27
Radishes (hardy)[12] Feb 21 Mar 23
Spinach (hardy)[12] Feb 21 Apr 2
Turnips (hardy)[12] Feb 21 Apr 12
Beets (semi-hardy)[12] Mar 7 May 6
Carrots (semi-hardy)[12] Mar 7 May 16
Cauliflower (semi-hardy)[12] Mar 7 not listed
Parsnips (semi-hardy)[12] Mar 7 May 16
Potatoes (semi-hardy)[12] Mar 7 Jul 10
Swiss chard (semi-hardy)[12] Mar 7 May 6
Snap beans (tender)[12] Mar 21 May 20
Sweet corn (tender)[12] Mar 21 May 20
Cucumbers (tender)[12] Mar 21 May 15
Summer squash (tender)[12] Mar 21 May 10
Cantaloupe (very tender)[12] Apr 4 Jun 28
Eggplant (very tender)[12] Apr 4 Jun 3 (from transplants)
Peppers (very tender)[12] Apr 4 Jun 13 (from transplants)
Tomatoes (very tender)[12] Apr 4 Jun 8 (from transplants)
Winter squash (very tender)[12] Apr 4 Jul 13
Watermelon (very tender)[12] Apr 4 Jun 28
Spacing, depth and soil temperature (CSU Extension)
Vegetable Min. soil temp Depth Spacing Days to harvest
Broccoli[13] 40°F 1/2 in 18 in 65
Cabbage[13] 40°F 1/2 in 18 in 85
Kohlrabi[13] 40°F 1/2 in 7-9 in 50
Lettuce[13] 35°F 1/4 in 7-9 in 60
Onions[13] 35°F 1/4 in (seed), 1-2 in (sets) 4-6 in 110
Peas[13] 40°F 1 in 4-6 in 65
Radishes[13] 40°F 1/2 in 2-3 in 30
Spinach[13] 40°F 1/2 in 4-6 in 40
Turnips[13] 40°F 1/2 in 4-6 in 50
Beets[13] 40°F 3/4-1 in 4-6 in 60
Carrots[13] 40°F 1/4 in 2-3 in 70
Cauliflower[13] 40°F 1/2 in 18 in –
Parsnips[13] 35°F 1/2 in 5-6 in 70
Potatoes[13] 45°F – – 125
Swiss chard[13] 40°F 1 in 7-9 in 60
Snap beans[13] 55°F 1-1 1/2 in 6 in 60
Sweet corn[13] 50°F 1-1 1/2 in 12 x 30 in or 9 x 36 in 60-90
Cucumbers[13] 60°F 1 in 6 in trellised, 24-36 in untrellised 55
Summer squash[13] 60°F 1-1 1/2 in 36-48 in 50
Cantaloupe[13] 60°F 1-1 1/2 in 36-48 in 85
Eggplant[13] 60°F 1/4 in 18-24 in 60
Peppers[13] 60°F 1/4 in 15-18 in 70
Tomatoes[13] 50°F 1/4 in 24 in trellised 65
Winter squash[13] 60°F 1-1 1/2 in 36-48 in 100
Watermelon[13] 60°F 1-1 1/2 in 36-48 in 85

Hardiness zone

Zone 8b means the coldest night of the winter averages 15°F to 20°F over 1991 to 2020[1]. The zone is about winter cold, not summer heat or frost dates[14]. All of Aiken's land area lies in ZIP code areas rated zone 8b[15].

Zone 8b: average annual extreme minimum temperature 15°F to 20°F (1991 to 2020)[1]. Modeled value at the city center: 15.4°F[1].

Share of the city's land area by ZIP code zone: zone 8b 100%[15].

All towns in zone 8b and what zone 8b means

Zone by ZIP code
ZIP code Zone Coldest night range
29803[15] 8b 15 to 20°F
29801[15] 8b 15 to 20°F
29851[15] 8b 15 to 20°F

Questions people ask

What growing zone is Aiken, South Carolina?
The center of Aiken is in USDA zone 8b on the 2023 map[1]. By land area, 100% of the city is in ZIP code areas rated 8b[15].
When is the last frost in Aiken?
The median last spring frost is March 21, so in half of years the last frost comes after that date[2]. In 1 of 10 years it comes after April 6[2].
When is the first frost in Aiken?
The median first fall frost is November 7, so in half of years it comes before that date[3]. In 1 of 10 years it comes before October 25[3].
When to plant tomatoes in Aiken?
CSU lists tomatoes as very tender, typically planted 2 or more weeks after the average last spring frost[11]. That makes April 4 the earliest start in Aiken[11].
How long is the growing season in Aiken?
The growing season is at least 232 days in half of years[4]. It is at least 208 days in 9 of 10 years[4].

Facts and sources

  1. The 2023 USDA Plant Hardiness Zone Map puts the center of Aiken, South Carolina in zone 8b. Zone 8b means an average annual extreme minimum temperature of 15°F to 20°F over 1991 to 2020. The map's modeled value at the city center is 15.4°F. USDA zone map 2023 (PRISM, OSU)
  2. Last spring frost (32°F) at this station: in 9 of 10 years the last frost comes after March 2, in half of years after March 21, and in 1 of 10 years after April 6 (NOAA 1991 to 2020 normals). The median last frost date is March 21. NOAA Climate Normals 1991-2020
  3. First fall frost (32°F) at this station: in 1 of 10 years the first frost comes before October 25, in half of years before November 7, and in 9 of 10 years before November 24 (NOAA 1991 to 2020 normals). The median first frost date is November 7. NOAA Climate Normals 1991-2020
  4. Growing season (days between the last spring and first fall 32°F frost) at this station: at least 208 days in 9 of 10 years, at least 232 days in half of years, and at least 259 days in 1 of 10 years. NOAA Climate Normals 1991-2020
  5. Frost dates on this page come from NOAA climate normals for the Aiken 5SE weather station (USC00380074), 3.2 miles from the center of Aiken at 492 feet, using 16 years of records from 1991 to 2020. NOAA Climate Normals 1991-2020
  6. Colorado State University Extension's vegetable planting guide (written for Colorado) groups broccoli, cabbage, kohlrabi, lettuce, onions, peas, radishes, spinach, turnips as hardy vegetables, with this rule: as early as 2-4 weeks before the average last... CSU Extension GardenNotes #720
  7. Hard freeze (28°F) at this station: the median last spring date is March 9 and the median first fall date is November 19. NOAA Climate Normals 1991-2020
  8. At this station the low reached 32°F or colder in 100% of years from 1991 to 2020, and 28°F or colder in 100% of years. NOAA Climate Normals 1991-2020
  9. Colorado State University Extension's vegetable planting guide (written for Colorado) groups beets, carrots, cauliflower, parsnips, potatoes, Swiss chard as semi-hardy vegetables, with this rule: as early as 0-2 weeks before the average last spring frost.... CSU Extension GardenNotes #720
  10. Colorado State University Extension's vegetable planting guide (written for Colorado) groups snap beans, sweet corn, cucumbers, summer squash as tender vegetables, with this rule: from seed around the average last spring frost; cucumber and summer squash... CSU Extension GardenNotes #720
  11. Colorado State University Extension's vegetable planting guide (written for Colorado) groups cantaloupe, eggplant, peppers, tomatoes, winter squash, watermelon as very tender vegetables, with this rule: typically 2 or more weeks after the average last... CSU Extension GardenNotes #720
  12. GardenFacts calculation: earliest planting date plus CSU days to harvest (table on this page), from the station's median last frost. NOAA Climate Normals 1991-2020
  13. CSU Extension vegetable table: soil temperature, depth, spacing, days to harvest (table on this page). CSU Extension GardenNotes #720
  14. USDA hardiness zones are based on the average annual extreme minimum winter temperature (the coldest night of each winter, averaged over 1991 to 2020 for the 2023 map), not on summer heat or frost dates. Each zone spans 10°F and each half zone (a or b)... USDA Plant Hardiness Zone Map
  15. Aiken, South Carolina overlaps 3 ZIP code areas. By land area, 100% lies in ZIP code areas rated zone 8b. USDA zone map 2023 (PRISM, OSU)

Frost dates are probabilities from 1991 to 2020 weather records at one NOAA station, not a forecast. Any year can be earlier or later. The hardiness zone describes the average coldest winter night, not frost dates or summer heat. Spots inside the city can differ (ZIP table). Planting rules come from Colorado State University Extension's guide, written for Colorado. A local extension office may give dates tuned to the area. Planting and harvest dates marked GardenFacts calculation are simple arithmetic from the facts above, not advice from the source.

Hardiness zone data: USDA Plant Hardiness Zone Map (2023), USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu, accessed October 30, 2026. This is not the official USDA map. Frost data: NOAA NCEI U.S. Climate Normals 1991-2020. Planting rules: Colorado State University Extension.