San Antonio Kelly AFB, TX Frost Dates & Growing Season

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

Last spring frost
Feb 22
~50% chance of frost after
First fall frost
Dec 2
~50% chance of frost before
Growing season
283 days
frost-free stretch
USDA zone
≈ 9a
estimated from nearby reference
Risky (1 year in 10)MedianSafe (9 years in 10)
Last spring frost Jan 16 Feb 22 Mar 12
First fall frost Dec 25 Dec 2 Nov 13
Hard freeze (28°F), median last Feb 1 · first Dec 16

Computed from NOAA 1991–2020 climate normals at the SAN ANTONIO KELLY AFB station. "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 San Antonio Kelly AFB

Computed from San Antonio Kelly AFB'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 28 – Jan 11 Mar 1 – Mar 8
🫑 Peppers Dec 14 – Dec 28 Mar 8 – Mar 15
🥬 Lettuce Jan 11 – Jan 25 Jan 25 – Feb 8 Jan 25 – Feb 22
🫛 Peas Jan 11 – Jan 25
🥕 Carrots Feb 1 – Feb 22
🥦 Broccoli Jan 4 – Jan 18 Feb 1 – Feb 15
🥬 Kale Jan 11 – Jan 25 Jan 25 – Feb 8 Jan 25 – Feb 8
🥒 Cucumbers Jan 25 – Feb 1 Mar 1 – Mar 8 Mar 1 – Mar 8
🥒 Zucchini Jan 25 – Feb 1 Mar 1 – Mar 8 Mar 1 – Mar 8
🫘 Green Beans (Bush) Mar 1 – Mar 8
🌽 Sweet Corn Mar 1 – Mar 8
🌿 Basil Jan 11 – Jan 25 Mar 1 – Mar 8 Mar 8 – Mar 15
🧄 Garlic Fall: Oct 21 – Nov 18

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 San Antonio Kelly AFB's dates automatically after a lookup.

Reading the season in San Antonio Kelly AFB

With roughly 283 frost-free days, San Antonio Kelly AFB 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 2 is late enough that fall planting is a full second season, not an afterthought.

Frequently asked questions

When is the last frost in San Antonio Kelly AFB, TX?

The average last spring frost in San Antonio Kelly AFB is around Feb 22, 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 San Antonio Kelly AFB, TX?

The average first fall frost in San Antonio Kelly AFB arrives around Dec 2. 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 San Antonio Kelly AFB?

About 283 frost-free days on average, from Feb 22 to Dec 2. That comfortably fits long-season crops like melons and winter squash, plus spring and fall plantings of cool-season vegetables.

What USDA zone is San Antonio Kelly AFB in?

USDA zone 9a 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.