Frost Dates for Sulphur, LA 70663
Last spring frost February 19 · First fall frost December 3 · 287 frost-free days · USDA Zone 9a
Frost probability for 70663
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | March 16 | February 19 | February 1 |
| Fall (first frost) | November 9 | December 3 | December 12 |
Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (23.0 km away); the 50% date is the median year.
Frost dates by ZIP code in Sulphur, LA
| ZIP | Last spring frost (50%) | First fall frost (50%) | Zone |
|---|---|---|---|
| 70663 | February 19 | December 3 | 9a |
| 70665 | February 19 | December 3 | 9b |
Month by month in Sulphur
| Month | What to do |
|---|---|
| January | Start herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable. |
| February | Last frost around February 19. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings. |
| March | Frost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini. |
| April | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| May | Harvest regularly to encourage production. Monitor for pests and disease. |
| June | Midsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall. |
| July | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| August | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| September | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| October | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| November | First fall frost approaching (around December 3). Transplant fall brassicas. Sow spinach, arugula, and radishes. |
| December | First frost around December 3. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season. |
What grows in a 287-day season
Frequently Asked Questions
What is the last frost date for Sulphur, LA (ZIP 70663)?
The median last spring frost date for Sulphur, LA (ZIP code 70663) is around February 19. 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.
What is the first fall frost date in Sulphur, LA?
The median first fall frost date for Sulphur, LA is around December 3. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.
How long is the growing season in Sulphur, LA?
The frost-free growing season in Sulphur is about 287 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.
What USDA hardiness zone is Sulphur, LA?
Based on frost date patterns, Sulphur falls approximately in 9a. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.
When should I start tomatoes indoors in Sulphur, LA?
Start tomato seeds indoors 6–8 weeks before your last frost date (around February 19). For Sulphur, that's roughly December 25 to January 8. Transplant outdoors 1–2 weeks after your last frost.
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