Frost Dates for Barnwell, SC 29812
Last spring frost March 28 · First fall frost November 5 · 222 frost-free days · USDA Zone 8b
ZIP 29812 has about 11,100 people.
Long season: 222 frost-free days. Spring frost risk spans March 9–April 16 (38 days). Fall frost risk spans October 17–November 24 (38 days).
Frost probability for 29812
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | April 16 | March 28 | March 9 |
| Fall (first frost) | October 17 | November 5 | November 24 |
Dates come from NOAA 1971–2000 freeze probabilities at BLACKVILLE 3 W (17.4 km away); the 50% date is the median year.
Which crops fit a 222-day season in Barnwell
In Barnwell (222 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Feb 21 | Apr 11–Apr 18 | 180 | fits: 80 days to maturity, 180 available after Apr 11. | Jul 6 |
| Pepper | Feb 14 | Apr 11–Apr 18 | 180 | fits: 75 days to maturity, 180 available after Apr 11. | Jul 11 |
| Lettuce | Jan 31 | Feb 28–Mar 7 | 257 | two-plantings: Plant Feb 28 and again by Sep 14; both mature before Nov 12. | Sep 14 |
| Carrots | — | Mar 7–Mar 14 | 264 | fits: 70 days to maturity, 264 available after Mar 7. | Sep 3 |
| Cucumber | Mar 7 | Apr 11–Apr 18 | 194 | two-plantings: Plant Apr 11 and again by Aug 9; both mature before Oct 22. | Aug 9 |
| Beans | — | Apr 4–Apr 18 | 208 | two-plantings: Plant Apr 4 and again by Aug 16; both mature before Oct 29. | Aug 16 |
| Peas | — | Jan 31–Apr 11 | 285 | fits: 65 days to maturity, 285 available after Jan 31. | Aug 25 |
| Zucchini | Mar 14 | Apr 11–Apr 18 | 194 | two-plantings: Plant Apr 11 and again by Aug 14; both mature before Oct 22. | Aug 14 |
| Onion | Jan 3 | Feb 28–Mar 14 | 257 | fits: 100 days to maturity, 257 available after Feb 28. | — |
| Spinach | — | Jan 31–Mar 21 | 299 | two-plantings: Plant Jan 31 and again by Oct 3; both mature before Nov 26. | Oct 3 |
| Kale | Jan 17 | Feb 28–Mar 14 | 271 | two-plantings: Plant Feb 28 and again by Sep 18; both mature before Nov 26. | Sep 18 |
| Broccoli | Jan 31 | Feb 28–Mar 14 | 257 | fits: 80 days to maturity, 257 available after Feb 28. | Aug 10 |
| Cabbage | Jan 31 | Feb 28–Mar 14 | 271 | fits: 70 days to maturity, 271 available after Feb 28. | Sep 3 |
| Radish | — | Jan 31–Apr 25 | 285 | two-plantings: Plant Jan 31 and again by Oct 4; both mature before Nov 12. | Oct 4 |
| Beets | — | Jan 31–Apr 25 | 285 | two-plantings: Plant Jan 31 and again by Sep 4; both mature before Nov 12. | Sep 4 |
| Potatoes | — | Mar 14–Mar 21 | 243 | fits: 90 days to maturity, 243 available after Mar 14. | — |
| Garlic | — | Nov 5 | 327 | overwinter: Plant Nov 5 to Nov 26; harvest the following summer. | Nov 26 |
| Strawberry | — | Feb 21–Apr 18 | 278 | perennial: A perennial: plant Feb 21; it fruits from the following year and keeps producing for several years. | — |
| Corn | Feb 28 | Apr 4–Apr 11 | 194 | fits: 75 days to maturity, 194 available after Apr 4. | Jul 18 |
| Pumpkin | Mar 14 | Apr 11–Apr 11 | 187 | fits: 100 days to maturity, 187 available after Apr 11. | Jun 23 |
| Cauliflower | Feb 14 | Mar 21–Apr 4 | 236 | fits: 75 days to maturity, 236 available after Mar 21. | Aug 15 |
| Swiss Chard | Jan 31 | Mar 14–Mar 14 | 243 | two-plantings: Plant Mar 14 and again by Sep 4; both mature before Nov 12. | Sep 4 |
| Arugula | — | Jan 31–Apr 25 | 299 | two-plantings: Plant Jan 31 and again by Oct 3; both mature before Nov 26. | Oct 3 |
| Brussel Sprouts | Jan 31 | Feb 28–Mar 14 | 271 | fits: 100 days to maturity, 271 available after Feb 28. | Aug 4 |
| Butternut Squash | Mar 14 | Apr 11–Apr 18 | 187 | fits: 100 days to maturity, 187 available after Apr 11. | Jun 23 |
| Eggplant | Feb 7 | Apr 11–Apr 18 | 180 | fits: 70 days to maturity, 180 available after Apr 11. | Jul 16 |
| Okra | Feb 28 | Apr 4–Apr 11 | 201 | two-plantings: Plant Apr 4 and again by Aug 14; both mature before Oct 22. | Aug 14 |
| Basil | Feb 21 | Apr 18–Apr 18 | 187 | two-plantings: Plant Apr 18 and again by Aug 9; both mature before Oct 22. | Aug 9 |
| Cilantro | — | Feb 28–Mar 21 | 257 | two-plantings: Plant Feb 28 and again by Sep 9; both mature before Nov 12. | Sep 9 |
| Parsley | Jan 17 | Apr 4–Apr 11 | 222 | fits: 70 days to maturity, 222 available after Apr 4. | Aug 20 |
| Celery | Jan 17 | Apr 4–Apr 18 | 222 | fits: 120 days to maturity, 222 available after Apr 4. | Jul 1 |
| Scallions | Jan 17 | Feb 28–Mar 14 | 271 | two-plantings: Plant Feb 28 and again by Sep 13; both mature before Nov 26. | Sep 13 |
| Turnip | — | Feb 28–Mar 14 | 271 | two-plantings: Plant Feb 28 and again by Sep 23; both mature before Nov 26. | Sep 23 |
| Kohlrabi | — | Feb 14–Feb 28 | 285 | two-plantings: Plant Feb 14 and again by Sep 18; both mature before Nov 26. | Sep 18 |
| Bok Choy | Feb 28 | Mar 21–Mar 28 | 236 | two-plantings: Plant Mar 21 and again by Sep 14; both mature before Nov 12. | Sep 14 |
| Collards | Jan 17 | Feb 28–Mar 14 | 271 | two-plantings: Plant Feb 28 and again by Sep 13; both mature before Nov 26. | Sep 13 |
| Cantaloupe | Mar 14 | Apr 11–Apr 18 | 180 | fits: 85 days to maturity, 180 available after Apr 11. | Jul 1 |
| Chives | Jan 3 | Apr 4–Apr 11 | 236 | fits: 90 days to maturity, 236 available after Apr 4. | — |
| Dill | — | Jan 31–Apr 25 | 285 | two-plantings: Plant Jan 31 and again by Sep 4; both mature before Nov 12. | Sep 4 |
| Oregano | Jan 17 | Apr 4–Apr 11 | 236 | fits: 80 days to maturity, 236 available after Apr 4. | — |
| Rosemary | Jan 3 | Apr 4–Apr 11 | 222 | fits: 80 days to maturity, 222 available after Apr 4. | — |
| Sage | Jan 31 | Apr 4–Apr 11 | 236 | fits: 75 days to maturity, 236 available after Apr 4. | — |
| Thyme | Jan 17 | Apr 4–Apr 11 | 236 | fits: 90 days to maturity, 236 available after Apr 4. | — |
| Calendula | Feb 14 | Mar 14–Mar 28 | 243 | two-plantings: Plant Mar 14 and again by Sep 9; both mature before Nov 12. | Sep 9 |
| Cosmos | Feb 28 | Mar 28–Apr 11 | 208 | two-plantings: Plant Mar 28 and again by Aug 9; both mature before Oct 22. | Aug 9 |
| Lavender | Jan 3 | Mar 28–Apr 11 | 243 | fits: 90 days to maturity, 243 available after Mar 28. | — |
| Marigolds | Feb 14 | Mar 28–Apr 4 | 208 | two-plantings: Plant Mar 28 and again by Aug 19; both mature before Oct 22. | Aug 19 |
| Melons | Mar 14 | Apr 11–Apr 18 | 180 | fits: 85 days to maturity, 180 available after Apr 11. | Jul 1 |
| Mint | — | Mar 28–Apr 11 | 243 | fits: 90 days to maturity, 243 available after Mar 28. | — |
| Nasturtiums | Feb 28 | Mar 28–Apr 4 | 208 | two-plantings: Plant Mar 28 and again by Aug 14; both mature before Oct 22. | Aug 14 |
| Pole Beans | — | Apr 4–Apr 18 | 201 | fits: 65 days to maturity, 201 available after Apr 4. | Aug 4 |
| Spaghetti Squash | Mar 14 | Apr 11–Apr 18 | 187 | fits: 90 days to maturity, 187 available after Apr 11. | Jul 3 |
| Sunflowers | — | Mar 28–Apr 11 | 208 | fits: 70 days to maturity, 208 available after Mar 28. | Jul 30 |
| Tomatillos | Jan 31 | Apr 4–Apr 11 | 187 | fits: 75 days to maturity, 187 available after Apr 4. | Jul 11 |
| Watermelon | Mar 14 | Apr 4–Apr 11 | 187 | fits: 80 days to maturity, 187 available after Apr 4. | Jul 6 |
| Yellow Squash | Mar 14 | Apr 11–Apr 18 | 194 | two-plantings: Plant Apr 11 and again by Aug 14; both mature before Oct 22. | Aug 14 |
| Zinnias | Feb 28 | Mar 28–Apr 11 | 208 | two-plantings: Plant Mar 28 and again by Aug 9; both mature before Oct 22. | Aug 9 |
Month by month in Barnwell
| Month | What to do |
|---|---|
| January | Start indoors: Chives (Jan 3), Lavender (Jan 3), Onion (Jan 3), Rosemary (Jan 3), Celery (Jan 17), Collards (Jan 17), +12 more. Direct sow from: Arugula (Jan 31), Beets (Jan 31), Dill (Jan 31), Peas (Jan 31), Radish (Jan 31), Spinach (Jan 31). |
| February | Start indoors: Eggplant (Feb 7), Calendula (Feb 14), Cauliflower (Feb 14), Marigolds (Feb 14), Pepper (Feb 14), Basil (Feb 21), +7 more. Direct sow from: Kohlrabi (Feb 14), Cilantro (Feb 28), Turnip (Feb 28). Transplant from: Broccoli (Feb 28), Brussel Sprouts (Feb 28), Cabbage (Feb 28), Collards (Feb 28), Kale (Feb 28), Lettuce (Feb 28), +2 more. Plant: Strawberry (Feb 21). |
| March | Start indoors: Cucumber (Mar 7), Butternut Squash (Mar 14), Cantaloupe (Mar 14), Melons (Mar 14), Pumpkin (Mar 14), Spaghetti Squash (Mar 14), +3 more. Direct sow from: Carrots (Mar 7), Potatoes (Mar 14), Sunflowers (Mar 28). Transplant from: Calendula (Mar 14), Swiss Chard (Mar 14), Bok Choy (Mar 21), Cauliflower (Mar 21), Cosmos (Mar 28), Lavender (Mar 28), +4 more. Last frost around March 28. |
| April | Direct sow from: Beans (Apr 4), Pole Beans (Apr 4). Transplant from: Celery (Apr 4), Chives (Apr 4), Corn (Apr 4), Okra (Apr 4), Oregano (Apr 4), Parsley (Apr 4), +17 more. |
| May | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| June | Last sowing dates: Butternut Squash (Jun 23), Pumpkin (Jun 23). |
| July | Last sowing dates: Cantaloupe (Jul 1), Celery (Jul 1), Melons (Jul 1), Spaghetti Squash (Jul 3), Tomato (Jul 6), Watermelon (Jul 6), +5 more. |
| August | Last sowing dates: Brussel Sprouts (Aug 4), Pole Beans (Aug 4), Basil (Aug 9), Cosmos (Aug 9), Cucumber (Aug 9), Zinnias (Aug 9), +10 more. |
| September | Last sowing dates: Cabbage (Sep 3), Carrots (Sep 3), Beets (Sep 4), Dill (Sep 4), Swiss Chard (Sep 4), Calendula (Sep 9), +8 more. |
| October | Last sowing dates: Arugula (Oct 3), Spinach (Oct 3), Radish (Oct 4). |
| November | Direct sow from: Garlic (Nov 5). First frost around November 5. Last sowing dates: Garlic (Nov 26). |
| December | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
Frequently Asked Questions
What is the last frost date for Barnwell, SC (ZIP 29812)?
The median last spring frost date for Barnwell, SC (ZIP code 29812) is around March 28. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area. One year in ten frost ends before March 9; one in ten it runs past April 16.
What is the first fall frost date in Barnwell, SC?
The median first fall frost date for Barnwell, SC is around November 5. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around October 17 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in Barnwell, SC?
The frost-free growing season in Barnwell is about 222 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side. In Barnwell (222 frost-free days, a long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
What USDA hardiness zone is Barnwell, SC?
Barnwell, SC is in USDA hardiness zone 8b (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in Barnwell, SC?
Start tomatoes indoors Feb 21 and plant out Apr 11 in Barnwell. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in Barnwell?
Two: plant Feb 28 and again by Sep 14; both mature before Nov 12.
When do I plant garlic in Barnwell?
Nov 5 to Nov 26; it overwinters and is ready the following summer.
Can I get two tomato crops in Barnwell?
Yes: plant out Apr 11 for a summer crop, and set out a second round of transplants by Jul 6 for a fall crop.
Which nearby ZIP has a longer season?
Sylvania (ZIP 30467) has 246 frost-free days, 24 more than Barnwell (ZIP 29812). See Sylvania ZIP 30467 frost dates
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