Frost Dates for Zachary, LA 70791
Last spring frost February 27 · First fall frost November 24 · 270 frost-free days · USDA Zone 9a
Frost probability for 70791
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | March 20 | February 27 | February 6 |
| Fall (first frost) | November 3 | November 24 | December 15 |
Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (21.8 km away); the 50% date is the median year.
Month by month in Zachary
| 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 27. 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 | First fall frost approaching (around November 24). Transplant fall brassicas. Sow spinach, arugula, and radishes. |
| November | First frost around November 24. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season. |
| December | Harvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year. |
What grows in a 270-day season
Frequently Asked Questions
What is the last frost date for Zachary, LA (ZIP 70791)?
The median last spring frost date for Zachary, LA (ZIP code 70791) is around February 27. 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 Zachary, LA?
The median first fall frost date for Zachary, LA is around November 24. 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 Zachary, LA?
The frost-free growing season in Zachary is about 270 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 Zachary, LA?
Based on frost date patterns, Zachary 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 Zachary, LA?
Start tomato seeds indoors 6–8 weeks before your last frost date (around February 27). For Zachary, that's roughly January 2 to January 16. Transplant outdoors 1–2 weeks after your last frost.
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