Darien, GA planting calendar
- USDA zone
- 9a20 to 25 °F
- Last frost
- Feb 20avg, 32°F
- First frost
- Dec 19avg, 32°F
- Growing season
- 298days
Darien, Georgia is in USDA plant hardiness zone 9a. Its average last spring frost is around February 20 and the first fall frost around December 19, giving a growing season of about 298 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.
Darien planting calendar
Each crop's windows are counted from Darien'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 | Jan 1 – Jan 9 | Feb 27 – Mar 6 | Apr 28 – May 18 | — |
| Pepper | Very tender | Jan 1 | Mar 6 – Mar 13 | May 5 – Jun 4 | — |
| Cucumber | Tender | Jan 23 – Jan 30 | Feb 27 – Mar 6 | Apr 18 – May 8 | — |
| Summer squash / zucchini | Tender | — | Feb 27 – Mar 6 | Apr 13 – Apr 28 | — |
| Bush bean | Tender | — | Feb 27 – Mar 6 | Apr 18 – Apr 28 | Oct 20 – Oct 30 |
| Sweet corn | Tender | — | Feb 20 – Mar 6 | Apr 21 – May 21 | — |
| Basil | Very tender | Jan 9 – Jan 23 | Feb 27 – Mar 6 | Mar 29 – Apr 13 | — |
| Lettuce | Half-hardy | Jan 9 – Jan 23 | Jan 23 – Feb 6 | Mar 9 – Mar 24 | Oct 6 – Oct 21 |
| Pea | Hardy | — | Jan 9 – Jan 23 | Mar 5 – Mar 20 | Sep 26 – Oct 11 |
| Spinach | Hardy | — | Jan 9 – Jan 23 | Feb 18 – Feb 28 | Oct 16 – Oct 26 |
| Carrot | Half-hardy | — | Jan 30 – Feb 6 | Mar 31 – Apr 20 | Sep 16 – Oct 6 |
| Broccoli | Half-hardy | Jan 1 – Jan 9 | Jan 23 – Feb 6 | Mar 19 – Apr 8 | Sep 21 – Oct 11 |
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 USC00097808. 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 | Mar 6 | Mar 27 | Nov 29 | Dec 25 | 268 |
| 32°F (freeze) | Feb 20 | Mar 16 | Dec 19 | Jan 15 | 298 |
| 28°F | Feb 3 | Mar 3 | Jan 3 | Feb 4 | 329 |
| 24°F | Jan 23 | Feb 18 | Jan 13 | Feb 11 | 363 |
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) | 6,930 | standard warm-season base (tomato, corn, beans) |
| Base 40°F (cool-season) | 10,410 | cool-season crops (brassicas, greens) |
Hardiness zone 9a
Darien sits in USDA plant hardiness zone 9a on the 2023 map — meaning its average annual extreme minimum winter temperature is about 20 to 25 °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 9a, or see all USDA hardiness zones.
Frequently asked questions
- What USDA hardiness zone is Darien?
- Darien, Georgia is in USDA plant hardiness zone 9a on the 2023 map (average annual extreme minimum temperature 20 to 25 °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 Darien?
- The average (median) last spring frost at 32°F is around February 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 March 16, so wait until then before setting out frost-tender plants if you want to be safe.
- When is the first fall frost in Darien?
- The average first fall frost at 32°F is around December 19. That leaves a growing season of about 298 days between the average last spring and first fall frosts.
- When should I start tomatoes in Darien?
- Start tomato seeds indoors about Jan 1 – Jan 9 and transplant them outside about Feb 27 – Mar 6, once the danger of frost has passed. Estimated first harvest is around Apr 28 – May 18.
- How long is the growing season in Darien?
- About 298 days at the 32°F threshold (NOAA 1991–2020, median) — the span between the average last spring frost (~February 20) and the average first fall frost (~December 19). 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 USC00097808 (Sapelo Is, 2.9 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.