Frost Dates for Seguin, TX 78155

Last spring frost March 4 · First fall frost November 21 · 262 frost-free days · USDA Zone 9a

Frost probability for 78155

Frost10%50%90%
Spring (last frost)March 29March 4February 8
Fall (first frost)October 31November 21December 12

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (25.9 km away); the 50% date is the median year.

Month by month in Seguin

MonthWhat to do
JanuaryStart peppers and eggplant indoors 8–10 weeks before your last frost (around March 4). 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 4. 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 21). Transplant fall brassicas. Sow spinach, arugula, and radishes.
NovemberFirst frost around November 21. 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 262-day season

Frequently Asked Questions

What is the last frost date for Seguin, TX (ZIP 78155)?

The median last spring frost date for Seguin, TX (ZIP code 78155) is around March 4. 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 Seguin, TX?

The median first fall frost date for Seguin, TX is around November 21. 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 Seguin, TX?

The frost-free growing season in Seguin is about 262 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 Seguin, TX?

Based on frost date patterns, Seguin 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 Seguin, TX?

Start tomato seeds indoors 6–8 weeks before your last frost date (around March 4). For Seguin, that's roughly January 8 to January 22. Transplant outdoors 1–2 weeks after your last frost.

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