Houston, TX Frost Dates & Growing Season

The two dates every Houston garden is planned around, plus ready-computed planting windows for the most popular crops.

Last spring frost
Feb 2
~50% chance of frost after
First fall frost
Dec 25
~50% chance of frost before
Growing season
326 days
frost-free stretch
USDA zone
9b
2023 hardiness map
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Dec 31 Feb 2 Mar 5
First fall frost Jan 21 Dec 25 Nov 27
Hard freeze (28°F), median last Jan 23 · first Jan 5

Computed from NOAA 1991–2020 climate normals at the Houston-Port station (9 km from central Houston). "Safe" means frost past that date happens only about one year in ten. Your exact garden can still run days either way with elevation and terrain — check your own ZIP with the frost date lookup.

Planting windows for Houston

Computed from Houston's own frost dates. Click any crop for the full zone-9 growing guide — varieties, spacing, fall plantings, and more.

CropStart seeds indoorsTransplantDirect sow
🍅 Tomatoes Dec 8 – Dec 22 Feb 9 – Feb 16
🫑 Peppers Nov 24 – Dec 8 Feb 16 – Feb 23
🥬 Lettuce Dec 22 – Jan 5 Jan 5 – Jan 19 Jan 5 – Feb 2
🫛 Peas Dec 22 – Jan 5
🥕 Carrots Jan 12 – Feb 2
🥦 Broccoli Dec 15 – Dec 29 Jan 12 – Jan 26
🥬 Kale Dec 22 – Jan 5 Jan 5 – Jan 19 Jan 5 – Jan 19
🥒 Cucumbers Jan 5 – Jan 12 Feb 9 – Feb 16 Feb 9 – Feb 16
🥒 Zucchini Jan 5 – Jan 12 Feb 9 – Feb 16 Feb 9 – Feb 16
🫘 Green Beans (Bush) Feb 9 – Feb 16
🌽 Sweet Corn Feb 9 – Feb 16
🌿 Basil Dec 22 – Jan 5 Feb 9 – Feb 16 Feb 16 – Feb 23
🧄 Garlic Fall: Nov 13 – Dec 11

Want this for all 50 crops, or as a printable seed-shelf schedule? Use the planting calendar and the seed starting scheduler — both can use Houston's dates automatically after a lookup.

Reading the season in Houston

With roughly 326 frost-free days, Houston gardens fit long-season crops — melons, winter squash, sweet potatoes — with room left for spring and fall rounds of greens and roots. The first frost around Dec 25 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in Houston, TX?

The average last spring frost in Houston is around Feb 2, based on 1991–2020 climate normals. That's a median — about half of years see a later frost, so tender crops are safest going out a week or two after this date.

When is the first frost in Houston, TX?

The average first fall frost in Houston arrives around Dec 25. Crops still in the garden need to mature before then, and frost-tender plants need harvesting or protection as the date approaches.

How long is the growing season in Houston?

About 326 frost-free days on average, from Feb 2 to Dec 25. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is Houston in?

USDA zone 9b on the 2023 Plant Hardiness Zone Map. Note that zones describe winter cold, not frost timing — these frost dates are the numbers to plan plantings around.