Frost dates for 70663 — Sulphur, LA
Last spring frostFeb 14median date
First fall frostDec 7median date
Growing season296 daysfrost-free
Hardiness zone9aZone 9a
How Sulphur compares
- In 8 years out of 10, the last spring frost in Sulphur falls between January 16 and March 11, a 54-day window. The first fall frost falls between November 14 and January 7.
- The median last frost is 17 days earlier than the Louisiana median of Mar 3.
- Its 296-day growing season is among the longest of the 388 Louisiana places with a regular frost season.
- The last frost is 17 days earlier than the zone 9a median of Mar 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 9a chart.
- The weather station records an average of 11 nights a year at or below 32°F.
- Compared with Lake Charles, LA, 10 km away, the last frost here is 16 days earlier than there and the growing season is 28 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | January 16 |
| 50% (median) | February 14 |
| 10% (safe for tender plants) | March 11 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 14 |
| 50% (median) | December 7 |
| 90% (late) | January 7 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Sulphur, LA
Frost dates for 70663 — Sulphur, LA — last frost Feb 14, first frost Dec 7, zone 9a. whenisthelastfrost.com
Crop
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Start indoors: Nov 22 to Dec 6Transplant outside: Jan 17 to Jan 31
Start indoors: Dec 6 to Dec 20Transplant outside: Feb 28 to Mar 14
Start indoors: Dec 6 to Dec 20Transplant outside: Feb 28 to Mar 14
Start indoors: Dec 20 to Jan 3Start indoors: Dec 20 to Jan 3Transplant outside: Feb 21 to Mar 7
Start indoors: Dec 20 to Jan 3Start indoors: Dec 20 to Jan 3Transplant outside: Jan 24 to Feb 7Sow outdoors: Jan 17 to Feb 21Plant for fall: Oct 12 to Nov 9
Start indoors: Dec 20 to Jan 3Start indoors: Dec 20 to Jan 3Transplant outside: Jan 17 to Jan 31Sow outdoors: Jan 17 to Jan 31Plant for fall: Sep 28 to Oct 19
Start indoors: Dec 20 to Jan 3Start indoors: Dec 20 to Jan 3Transplant outside: Jan 31 to Feb 14Plant for fall: Aug 31 to Sep 21
Start indoors: Dec 20 to Jan 3Start indoors: Dec 20 to Jan 3Transplant outside: Jan 24 to Feb 7Plant for fall: Aug 31 to Sep 21
Start indoors: Dec 20 to Jan 3Start indoors: Dec 20 to Jan 3Transplant outside: Jan 31 to Feb 14Plant for fall: Aug 31 to Sep 21
Start indoors: Jan 3 to Jan 17Transplant outside: Mar 7 to Mar 21Sow outdoors: Mar 7 to Mar 21
Start indoors: Jan 3 to Jan 17Transplant outside: Feb 21 to Mar 7
Sow outdoors: Jan 3 to Jan 24Plant for fall: Sep 14 to Oct 5
Sow outdoors: Jan 3 to Jan 24Plant for fall: Oct 12 to Nov 2
Sow outdoors: Jan 10 to Feb 21Plant for fall: Oct 26 to Nov 16
Start indoors: Jan 17 to Jan 24Transplant outside: Feb 28 to Mar 7Sow outdoors: Feb 21 to Mar 7Plant for fall: Sep 21 to Oct 5
Start indoors: Jan 17 to Jan 24Sow outdoors: Feb 21 to Mar 7Plant for fall: Sep 28 to Oct 12
Start indoors: Jan 17 to Jan 24Sow outdoors: Feb 21 to Mar 7
Start indoors: Jan 17 to Jan 24Transplant outside: Feb 28 to Mar 14
Sow outdoors: Jan 24 to Feb 21Plant for fall: Sep 14 to Sep 28
Sow outdoors: Jan 24 to Feb 21Plant for fall: Sep 28 to Oct 12
Sow outdoors: Jan 24 to Feb 14
Sow outdoors: Jan 31 to Feb 28Plant for fall: Sep 28 to Oct 12
Sow outdoors: Jan 31 to Feb 21Plant for fall: Oct 12 to Nov 2
Sow outdoors: Feb 21 to Mar 14Plant for fall: Sep 21 to Oct 5
Sow outdoors: Feb 21 to Mar 7
Transplant outside: Feb 28 to Mar 21
Plant for fall: Nov 23 to Dec 28
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Sulphur, LA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Nov 22 – Dec 6 | Jan 17 – Jan 31 | — | — |
| Peppers | Dec 6 – Dec 20 | Feb 28 – Mar 14 | — | — |
| Eggplant | Dec 6 – Dec 20 | Feb 28 – Mar 14 | — | — |
| Tomatoes | Dec 20 – Jan 3 | Feb 21 – Mar 7 | — | — |
| Lettuce | Dec 20 – Jan 3 | Jan 24 – Feb 7 | Jan 17 – Feb 21 | Oct 12 – Nov 9 |
| Kale | Dec 20 – Jan 3 | Jan 17 – Jan 31 | Jan 17 – Jan 31 | Sep 28 – Oct 19 |
| Broccoli | Dec 20 – Jan 3 | Jan 31 – Feb 14 | — | Aug 31 – Sep 21 |
| Cabbage | Dec 20 – Jan 3 | Jan 24 – Feb 7 | — | Aug 31 – Sep 21 |
| Cauliflower | Dec 20 – Jan 3 | Jan 31 – Feb 14 | — | Aug 31 – Sep 21 |
| Okra | Jan 3 – Jan 17 | Mar 7 – Mar 21 | Mar 7 – Mar 21 | — |
| Basil | Jan 3 – Jan 17 | Feb 21 – Mar 7 | — | — |
| Peas | — | — | Jan 3 – Jan 24 | Sep 14 – Oct 5 |
| Spinach | — | — | Jan 3 – Jan 24 | Oct 12 – Nov 2 |
| Radishes | — | — | Jan 10 – Feb 21 | Oct 26 – Nov 16 |
| Cucumbers | Jan 17 – Jan 24 | Feb 28 – Mar 7 | Feb 21 – Mar 7 | Sep 21 – Oct 5 |
| Zucchini & Summer Squash | Jan 17 – Jan 24 | — | Feb 21 – Mar 7 | Sep 28 – Oct 12 |
| Winter Squash & Pumpkins | Jan 17 – Jan 24 | — | Feb 21 – Mar 7 | — |
| Melons & Watermelon | Jan 17 – Jan 24 | Feb 28 – Mar 14 | — | — |
| Carrots | — | — | Jan 24 – Feb 21 | Sep 14 – Sep 28 |
| Beets | — | — | Jan 24 – Feb 21 | Sep 28 – Oct 12 |
| Potatoes | — | — | Jan 24 – Feb 14 | — |
| Swiss Chard | — | — | Jan 31 – Feb 28 | Sep 28 – Oct 12 |
| Cilantro | — | — | Jan 31 – Feb 21 | Oct 12 – Nov 2 |
| Green Beans | — | — | Feb 21 – Mar 14 | Sep 21 – Oct 5 |
| Sweet Corn | — | — | Feb 21 – Mar 7 | — |
| Sweet Potatoes | — | Feb 28 – Mar 21 | — | — |
| Garlic | — | — | — | Nov 23 – Dec 28 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Lake Charles, LA weather station, 18 km away (elevation 13 ft (4 m)).
ZIP codes in Sulphur: 70663 70664 70665
Frost dates near Sulphur
- Westlake Mar 2 · Nov 25
- Lake Charles Mar 2 · Nov 25
- Vinton Feb 28 · Nov 23
- Dequincy Mar 2 · Nov 25
- Hackberry Feb 3 · Dec 24
- Starks Feb 28 · Nov 23
- Ragley Mar 2 · Nov 25
- Iowa Feb 14 · Dec 7
Frequently asked questions
When is the last frost in Sulphur, LA?
The median last spring frost in Sulphur, LA is February 14. There is still about a 10% chance of frost after March 11, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Sulphur, LA?
The median first fall frost is December 7, with about a 10% chance of frost before November 14.
How long is the growing season in Sulphur, LA?
About 296 days between the median last spring frost and first fall frost.
What planting zone is Sulphur, LA?
Sulphur, LA is in USDA hardiness zone 9a.