Frost Dates for Big Spring, TX 79721

Big Spring has 2 ZIP codes. The Big Spring, TX frost page lists all of them with their dates.

Last spring frost March 31 · First fall frost November 9 · 223 frost-free days · USDA Zone 8a

Frost probability for 79721

Frost10%50%90%
Spring (last frost)April 17March 31March 14
Fall (first frost)October 22November 9November 26

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (52.2 km away); the 50% date is the median year.

Month by month in Big Spring

MonthWhat to do
JanuaryStart peppers and eggplant indoors 8–10 weeks before your last frost (around March 31). Start tomatoes about two weeks later, 6–8 weeks before last frost.
FebruaryStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
MarchLast frost around March 31. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
AprilFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
MaySuccession plant lettuce and greens. Keep beds weeded and watered consistently.
JuneHarvest regularly to encourage production. Monitor for pests and disease.
JulyMidsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall.
AugustDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
SeptemberDirect sow carrots and beets for fall harvest. Start fall broccoli and kale indoors.
OctoberFirst fall frost approaching (around November 9). Transplant fall brassicas. Sow spinach, arugula, and radishes.
NovemberFirst frost around November 9. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.
DecemberHarvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year.

What grows in a 223-day season

Frequently Asked Questions

What is the last frost date for Big Spring, TX (ZIP 79721)?

The median last spring frost date for Big Spring, TX (ZIP code 79721) is around March 31. 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 Big Spring, TX?

The median first fall frost date for Big Spring, TX is around November 9. 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 Big Spring, TX?

The frost-free growing season in Big Spring is about 223 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 Big Spring, TX?

Based on frost date patterns, Big Spring falls approximately in 8a. 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 Big Spring, TX?

Start tomato seeds indoors 6–8 weeks before your last frost date (around March 31). For Big Spring, that's roughly February 4 to February 18. Transplant outdoors 1–2 weeks after your last frost.

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