Frost dates for 29466Mount Pleasant, SC
The average last spring frost in Mount Pleasant is March 13 and the average first fall frost is November 30, giving a typical growing season of about 262 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 13
- Average first fall frost
- Nov 30
- Growing season
- 262 days
Safer after Mar 30 (1-in-10 risk)
Possible by Nov 11 (1-in-10 risk)
First frost typically in 28 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Mar 6 · Mar 25 · Apr 10 | Nov 1 · Nov 16 · Dec 5 | 236 days | 100% |
| Frost / freeze (32°F) | Feb 19 · Mar 13 · Mar 30 | Nov 11 · Nov 30 · Dec 24 | 262 days | 100% |
| Hard freeze (28°F) | Feb 1 · Mar 1 · Mar 22 | Nov 25 · Dec 16 · Jan 10 | 288 days | 100% |
Planting calendar for Mount Pleasant
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Feb 10 – Apr 18 |
| Tomatoes | Transplant outdoors | Mar 29 – Aug 10 |
| Peppers | Start seeds indoors | Feb 10 – Mar 13 |
| Peppers | Transplant outdoors | Apr 12 – May 13 |
| Eggplant | Start seeds indoors | Feb 27 – Mar 28 |
| Eggplant | Transplant outdoors | Apr 12 – May 13 |
| Cucumbers | Sow outdoors | Apr 12 – Aug 20 |
| Summer squash | Sow outdoors | Mar 29 – May 13 |
| Winter squash & pumpkins | Sow outdoors | Apr 12 – May 13 |
| Snap beans | Sow outdoors | Mar 29 – Sep 12 |
| Sweet corn | Sow outdoors | Mar 29 – Aug 10 |
| Watermelon & cantaloupe | Sow outdoors | Apr 12 – May 13 |
| Okra | Sow outdoors | Apr 5 – Apr 28 |
| Peas | Sow outdoors (spring) | Feb 10 – Mar 28 |
| Potatoes | Plant outdoors (spring) | Feb 10 – Apr 12 |
| Onions | Start seeds indoors (spring) | Dec 30 – Jan 26 |
| Onions | Transplant outdoors (spring) | Feb 27 – Mar 28 |
| Broccoli | Start seeds indoors (spring) | Jan 23 – Feb 26 |
| Broccoli | Transplant outdoors (spring) | Feb 27 – Mar 28 |
| Broccoli | Start seeds indoors (fall) | Jul 31 – Aug 10 |
| Broccoli | Transplant outdoors (fall) | Aug 30 – Sep 10 |
| Cabbage | Start seeds indoors (spring) | Jan 13 – Feb 10 |
| Cabbage | Transplant outdoors (spring) | Feb 10 – Mar 13 |
| Cabbage | Start seeds indoors (fall) | Jul 21 – Aug 20 |
| Cabbage | Transplant outdoors (fall) | Aug 20 – Sep 20 |
| Leaf lettuce | Sow outdoors (spring) | Feb 10 – Apr 28 |
| Leaf lettuce | Sow outdoors (fall) | Aug 20 – Oct 6 |
| Spinach | Sow outdoors (spring) | Feb 3 – Mar 19 |
| Spinach | Sow outdoors (fall) | Sep 6 – Oct 11 |
| Radishes | Sow outdoors (spring) | Feb 10 – Apr 2 |
| Radishes | Sow outdoors (fall) | Aug 20 – Oct 21 |
| Kale | Sow outdoors (spring) | Feb 27 – Mar 19 |
| Kale | Sow outdoors (fall) | Aug 13 – Sep 20 |
| Carrots | Sow outdoors (spring) | Mar 13 – Apr 28 |
| Carrots | Sow outdoors (fall) | Jul 21 – Sep 5 |
| Garlic | Plant outdoors (fall) | Nov 20 – Dec 21 |
Where these dates come from
ZIP code 29466 is matched to the NOAA station Sullivans Is, SC, 12.7 km away, at 5 ft elevation (2 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Sullivans Is, SC (used) | 5 ft | Mar 13 | Nov 30 |
| Charleston City, SC | 10 ft | Feb 4 | Dec 30 |
| Charleston Intl Ap, SC | 40 ft | Mar 7 | Nov 27 |
| Mcclellanville, SC | 12 ft | Mar 17 | Nov 21 |
Frost dates near Mount Pleasant
- Mount Pleasant, SC 29464 · last Mar 13, first Nov 30
- Charleston, SC 29413 · last Mar 13, first Nov 30
- Isle Of Palms, SC 29451 · last Mar 13, first Nov 30
- Sullivans Island, SC 29482 · last Mar 13, first Nov 30
- North Charleston, SC 29415 · last Mar 7, first Nov 27
- Huger, SC 29450 · last Mar 7, first Nov 27
- Awendaw, SC 29429 · last Feb 28, first Dec 1
- Hanahan, SC 29410 · last Mar 7, first Nov 27
Frequently asked questions
- When is the last frost in Mount Pleasant, SC?
- For ZIP code 29466, the average last spring frost (32°F) is March 13, based on NOAA 1991-2020 climate normals for the Sullivans Is, SC weather station. There is a 1-in-10 chance of a frost after March 30.
- When is the first frost in Mount Pleasant, SC?
- The average first fall frost (32°F) is November 30. There is a 1-in-10 chance of frost by November 11, so tender plants are at risk from that point on.
- How long is the growing season in 29466?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 262 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.