Gaffney, SC planting calendar
- USDA zone
- 8a10 to 15 °F
- Last frost
- Apr 20avg, 32°F
- First frost
- Oct 24avg, 32°F
- Growing season
- 186days
Gaffney, South Carolina is in USDA plant hardiness zone 8a. Its average last spring frost is around April 20 and the first fall frost around October 24, giving a growing season of about 186 days (NOAA 1991–2020 normals, 32°F, median). Start tender crops like tomatoes and peppers indoors weeks before the last frost and set them out afterward; sow hardy crops such as peas, spinach, and lettuce before it. The planner below turns those frost dates into a printable per-crop planting calendar.
Gaffney planting calendar
Each crop's windows are counted from Gaffney's average frost dates. hatched = start seeds indoors, solid green = plant out, teal = a fall sowing, and the terracotta dot marks the estimated first harvest. Ranges are extension-guide planning guidance, not guarantees.
- Start indoors
- Plant out
- Fall sowing
- First harvest
| Crop | Frost tolerance | Start indoors | Plant out | First harvest | Fall planting |
|---|---|---|---|---|---|
| Tomato | Tender | Feb 23 – Mar 9 | Apr 27 – May 4 | Jun 26 – Jul 16 | — |
| Pepper | Very tender | Feb 9 – Feb 23 | May 4 – May 11 | Jul 3 – Aug 2 | — |
| Cucumber | Tender | Mar 23 – Mar 30 | Apr 27 – May 4 | Jun 16 – Jul 6 | — |
| Summer squash / zucchini | Tender | — | Apr 27 – May 4 | Jun 11 – Jun 26 | — |
| Bush bean | Tender | — | Apr 27 – May 4 | Jun 16 – Jun 26 | Aug 25 – Sep 4 |
| Sweet corn | Tender | — | Apr 20 – May 4 | Jun 19 – Jul 19 | — |
| Basil | Very tender | Mar 9 – Mar 23 | Apr 27 – May 4 | May 27 – Jun 11 | — |
| Lettuce | Half-hardy | Mar 9 – Mar 23 | Mar 23 – Apr 6 | May 7 – May 22 | Aug 11 – Aug 26 |
| Pea | Hardy | — | Mar 9 – Mar 23 | May 3 – May 18 | Aug 1 – Aug 16 |
| Spinach | Hardy | — | Mar 9 – Mar 23 | Apr 18 – Apr 28 | Aug 21 – Aug 31 |
| Carrot | Half-hardy | — | Mar 30 – Apr 6 | May 29 – Jun 18 | Jul 22 – Aug 11 |
| Broccoli | Half-hardy | Feb 23 – Mar 9 | Mar 23 – Apr 6 | May 17 – Jun 6 | Jul 27 – Aug 16 |
Data: NOAA NCEI U.S. Climate Normals 1991–2020 (public domain) and USDA Plant Hardiness Zone Map 2023. Planting windows synthesized from U.S. Cooperative Extension guides.
Frost & freeze dates
From NOAA's 1991–2020 Climate Normals at station USC00386293. The median (p50) is the average date; the 90%-safe column is the date the freeze has passed in about 9 years out of 10 (p10 for spring, p90 for fall) — the conservative date to plant after or harvest before.
| Threshold | Last spring — avg | Last spring — 90%-safe | First fall — avg | First fall — 90%-safe | Season (days) |
|---|---|---|---|---|---|
| 36°F | May 1 | May 15 | Oct 15 | Oct 29 | 168 |
| 32°F (freeze) | Apr 20 | May 6 | Oct 24 | Nov 5 | 186 |
| 28°F | Apr 6 | Apr 24 | Nov 1 | Nov 16 | 210 |
| 24°F | Mar 24 | Apr 10 | Nov 12 | Dec 1 | 234 |
32°F is the standard "freeze" line that damages tender crops; lighter 36°F frost can nip the most cold-sensitive plants, while hardy crops shrug off light frost down toward 28°F. Use the threshold that matches what you are protecting.
Growing degree days
Growing degree days (GDD) accumulate warmth above a base temperature over the year — a better predictor of crop development than the calendar alone. Warm-season crops need a long, warm GDD total; a short, cool GDD total favors greens and brassicas.
| Model | °F·days | Used for |
|---|---|---|
| Base 50°F (warm-season) | 4,124 | standard warm-season base (tomato, corn, beans) |
| Base 40°F (cool-season) | 6,890 | cool-season crops (brassicas, greens) |
Hardiness zone 8a
Gaffney sits in USDA plant hardiness zone 8a on the 2023 map — meaning its average annual extreme minimum winter temperature is about 10 to 15 °F. That number tells you which perennials, shrubs, and trees reliably survive an average winter here; it does not set your planting dates, which come from the frost calendar above.
Explore more places in zone 8a, or see all USDA hardiness zones.
Frequently asked questions
- What USDA hardiness zone is Gaffney?
- Gaffney, South Carolina is in USDA plant hardiness zone 8a on the 2023 map (average annual extreme minimum temperature 10 to 15 °F) — from the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. See the methodology page for sources.
- When is the last frost in Gaffney?
- The average (median) last spring frost at 32°F is around April 20, from NOAA's 1991–2020 climate normals at the nearest reporting station. Roughly one year in ten the last frost is as late as May 6, so wait until then before setting out frost-tender plants if you want to be safe.
- When is the first fall frost in Gaffney?
- The average first fall frost at 32°F is around October 24. That leaves a growing season of about 186 days between the average last spring and first fall frosts.
- When should I start tomatoes in Gaffney?
- Start tomato seeds indoors about Feb 23 – Mar 9 and transplant them outside about Apr 27 – May 4, once the danger of frost has passed. Estimated first harvest is around Jun 26 – Jul 16.
- How long is the growing season in Gaffney?
- About 186 days at the 32°F threshold (NOAA 1991–2020, median) — the span between the average last spring frost (~April 20) and the average first fall frost (~October 24). Cold-hardy crops extend usable time at both ends; frost-tender crops fit inside it.
Sources & method
Frost, freeze, growing-season, and growing-degree-day figures are NOAA NCEI U.S. Climate Normals 1991–2020 for station USC00386293 (Ninety Nine Is, 6.4 km away). The hardiness zone is the USDA Plant Hardiness Zone Map 2023, matched to this location's ZIP. Planting windows are computed by counting from the average last and first frost using per-crop offsets synthesized from U.S. Cooperative Extension guides — the full method and citations are on the methodology page.