Frost Dates for San Antonio, TX 78228
San Antonio has 59 ZIP codes. The San Antonio, TX frost page lists all of them with their dates.
Last spring frost February 28 · First fall frost November 25 · 270 frost-free days · USDA Zone 9a
ZIP 78228 has about 56,200 people, one of 59 ZIP codes in San Antonio.
Very long season: 270 frost-free days. Spring frost risk spans February 6–March 23 (45 days). Fall frost risk spans November 8–December 13 (35 days).
Frost probability for 78228
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | March 23 | February 28 | February 6 |
| Fall (first frost) | November 8 | November 25 | December 13 |
Dates come from NOAA 1971–2000 freeze probabilities at SAN ANTONIO INTL AP (12.6 km away); the 50% date is the median year.
Which crops fit a 270-day season in San Antonio
In San Antonio (270 frost-free days, a very long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
| Crop | Start indoors | Plant out / sow | Days you have | Verdict | Last sow date |
|---|---|---|---|---|---|
| Tomato | Jan 24 | Mar 14–Mar 21 | 228 | fits: 80 days to maturity, 228 available after Mar 14. | Jul 26 |
| Pepper | Jan 17 | Mar 14–Mar 21 | 228 | fits: 75 days to maturity, 228 available after Mar 14. | Jul 31 |
| Lettuce | Jan 3 | Jan 31–Feb 7 | 305 | two-plantings: Plant Jan 31 and again by Oct 4; both mature before Dec 2. | Oct 4 |
| Carrots | — | Feb 7–Feb 14 | 312 | fits: 70 days to maturity, 312 available after Feb 7. | Sep 23 |
| Cucumber | Feb 7 | Mar 14–Mar 21 | 242 | two-plantings: Plant Mar 14 and again by Aug 29; both mature before Nov 11. | Aug 29 |
| Beans | — | Mar 7–Mar 21 | 256 | two-plantings: Plant Mar 7 and again by Sep 5; both mature before Nov 18. | Sep 5 |
| Peas | — | Jan 3–Mar 14 | 333 | fits: 65 days to maturity, 333 available after Jan 3. | Sep 14 |
| Zucchini | Feb 14 | Mar 14–Mar 21 | 242 | two-plantings: Plant Mar 14 and again by Sep 3; both mature before Nov 11. | Sep 3 |
| Onion | Dec 6 | Jan 31–Feb 14 | 305 | fits: 100 days to maturity, 305 available after Jan 31. | — |
| Spinach | — | Jan 3–Feb 21 | 347 | two-plantings: Plant Jan 3 and again by Oct 23; both mature before Dec 16. | Oct 23 |
| Kale | Dec 20 | Jan 31–Feb 14 | 319 | two-plantings: Plant Jan 31 and again by Oct 8; both mature before Dec 16. | Oct 8 |
| Broccoli | Jan 3 | Jan 31–Feb 14 | 305 | fits: 80 days to maturity, 305 available after Jan 31. | Aug 30 |
| Cabbage | Jan 3 | Jan 31–Feb 14 | 319 | fits: 70 days to maturity, 319 available after Jan 31. | Sep 23 |
| Radish | — | Jan 3–Mar 28 | 333 | two-plantings: Plant Jan 3 and again by Oct 24; both mature before Dec 2. | Oct 24 |
| Beets | — | Jan 3–Mar 28 | 333 | two-plantings: Plant Jan 3 and again by Sep 24; both mature before Dec 2. | Sep 24 |
| Potatoes | — | Feb 14–Feb 21 | 291 | fits: 90 days to maturity, 291 available after Feb 14. | — |
| Garlic | — | Nov 25 | 375 | overwinter: Plant Nov 25 to Dec 16; harvest the following summer. | Dec 16 |
| Strawberry | — | Jan 24–Mar 21 | 326 | perennial: A perennial: plant Jan 24; it fruits from the following year and keeps producing for several years. | — |
| Corn | Jan 31 | Mar 7–Mar 14 | 242 | fits: 75 days to maturity, 242 available after Mar 7. | Aug 7 |
| Pumpkin | Feb 14 | Mar 14–Mar 14 | 235 | fits: 100 days to maturity, 235 available after Mar 14. | Jul 13 |
| Cauliflower | Jan 17 | Feb 21–Mar 7 | 284 | fits: 75 days to maturity, 284 available after Feb 21. | Sep 4 |
| Swiss Chard | Jan 3 | Feb 14–Feb 14 | 291 | two-plantings: Plant Feb 14 and again by Sep 24; both mature before Dec 2. | Sep 24 |
| Arugula | — | Jan 3–Mar 28 | 347 | two-plantings: Plant Jan 3 and again by Oct 23; both mature before Dec 16. | Oct 23 |
| Brussel Sprouts | Jan 3 | Jan 31–Feb 14 | 319 | fits: 100 days to maturity, 319 available after Jan 31. | Aug 24 |
| Butternut Squash | Feb 14 | Mar 14–Mar 21 | 235 | fits: 100 days to maturity, 235 available after Mar 14. | Jul 13 |
| Eggplant | Jan 10 | Mar 14–Mar 21 | 228 | fits: 70 days to maturity, 228 available after Mar 14. | Aug 5 |
| Okra | Jan 31 | Mar 7–Mar 14 | 249 | two-plantings: Plant Mar 7 and again by Sep 3; both mature before Nov 11. | Sep 3 |
| Basil | Jan 24 | Mar 21–Mar 21 | 235 | two-plantings: Plant Mar 21 and again by Aug 29; both mature before Nov 11. | Aug 29 |
| Cilantro | — | Jan 31–Feb 21 | 305 | two-plantings: Plant Jan 31 and again by Sep 29; both mature before Dec 2. | Sep 29 |
| Parsley | Dec 20 | Mar 7–Mar 14 | 270 | fits: 70 days to maturity, 270 available after Mar 7. | Sep 9 |
| Celery | Dec 20 | Mar 7–Mar 21 | 270 | fits: 120 days to maturity, 270 available after Mar 7. | Jul 21 |
| Scallions | Dec 20 | Jan 31–Feb 14 | 319 | two-plantings: Plant Jan 31 and again by Oct 3; both mature before Dec 16. | Oct 3 |
| Turnip | — | Jan 31–Feb 14 | 319 | two-plantings: Plant Jan 31 and again by Oct 13; both mature before Dec 16. | Oct 13 |
| Kohlrabi | — | Jan 17–Jan 31 | 333 | two-plantings: Plant Jan 17 and again by Oct 8; both mature before Dec 16. | Oct 8 |
| Bok Choy | Jan 31 | Feb 21–Feb 28 | 284 | two-plantings: Plant Feb 21 and again by Oct 4; both mature before Dec 2. | Oct 4 |
| Collards | Dec 20 | Jan 31–Feb 14 | 319 | two-plantings: Plant Jan 31 and again by Oct 3; both mature before Dec 16. | Oct 3 |
| Cantaloupe | Feb 14 | Mar 14–Mar 21 | 228 | fits: 85 days to maturity, 228 available after Mar 14. | Jul 21 |
| Chives | Dec 6 | Mar 7–Mar 14 | 284 | fits: 90 days to maturity, 284 available after Mar 7. | — |
| Dill | — | Jan 3–Mar 28 | 333 | two-plantings: Plant Jan 3 and again by Sep 24; both mature before Dec 2. | Sep 24 |
| Oregano | Dec 20 | Mar 7–Mar 14 | 284 | fits: 80 days to maturity, 284 available after Mar 7. | — |
| Rosemary | Dec 6 | Mar 7–Mar 14 | 270 | fits: 80 days to maturity, 270 available after Mar 7. | — |
| Sage | Jan 3 | Mar 7–Mar 14 | 284 | fits: 75 days to maturity, 284 available after Mar 7. | — |
| Thyme | Dec 20 | Mar 7–Mar 14 | 284 | fits: 90 days to maturity, 284 available after Mar 7. | — |
| Calendula | Jan 17 | Feb 14–Feb 28 | 291 | two-plantings: Plant Feb 14 and again by Sep 29; both mature before Dec 2. | Sep 29 |
| Cosmos | Jan 31 | Feb 28–Mar 14 | 256 | two-plantings: Plant Feb 28 and again by Aug 29; both mature before Nov 11. | Aug 29 |
| Lavender | Dec 6 | Feb 28–Mar 14 | 291 | fits: 90 days to maturity, 291 available after Feb 28. | — |
| Marigolds | Jan 17 | Feb 28–Mar 7 | 256 | two-plantings: Plant Feb 28 and again by Sep 8; both mature before Nov 11. | Sep 8 |
| Melons | Feb 14 | Mar 14–Mar 21 | 228 | fits: 85 days to maturity, 228 available after Mar 14. | Jul 21 |
| Mint | — | Feb 28–Mar 14 | 291 | fits: 90 days to maturity, 291 available after Feb 28. | — |
| Nasturtiums | Jan 31 | Feb 28–Mar 7 | 256 | two-plantings: Plant Feb 28 and again by Sep 3; both mature before Nov 11. | Sep 3 |
| Pole Beans | — | Mar 7–Mar 21 | 249 | fits: 65 days to maturity, 249 available after Mar 7. | Aug 24 |
| Spaghetti Squash | Feb 14 | Mar 14–Mar 21 | 235 | fits: 90 days to maturity, 235 available after Mar 14. | Jul 23 |
| Sunflowers | — | Feb 28–Mar 14 | 256 | fits: 70 days to maturity, 256 available after Feb 28. | Aug 19 |
| Tomatillos | Jan 3 | Mar 7–Mar 14 | 235 | fits: 75 days to maturity, 235 available after Mar 7. | Jul 31 |
| Watermelon | Feb 14 | Mar 7–Mar 14 | 235 | fits: 80 days to maturity, 235 available after Mar 7. | Jul 26 |
| Yellow Squash | Feb 14 | Mar 14–Mar 21 | 242 | two-plantings: Plant Mar 14 and again by Sep 3; both mature before Nov 11. | Sep 3 |
| Zinnias | Jan 31 | Feb 28–Mar 14 | 256 | two-plantings: Plant Feb 28 and again by Aug 29; both mature before Nov 11. | Aug 29 |
Month by month in San Antonio
| Month | What to do |
|---|---|
| January | Start indoors: Broccoli (Jan 3), Brussel Sprouts (Jan 3), Cabbage (Jan 3), Lettuce (Jan 3), Sage (Jan 3), Swiss Chard (Jan 3), +14 more. Direct sow from: Arugula (Jan 3), Beets (Jan 3), Dill (Jan 3), Peas (Jan 3), Radish (Jan 3), Spinach (Jan 3), +3 more. Transplant from: Broccoli (Jan 31), Brussel Sprouts (Jan 31), Cabbage (Jan 31), Collards (Jan 31), Kale (Jan 31), Lettuce (Jan 31), +2 more. Plant: Strawberry (Jan 24). |
| February | Start indoors: Cucumber (Feb 7), Butternut Squash (Feb 14), Cantaloupe (Feb 14), Melons (Feb 14), Pumpkin (Feb 14), Spaghetti Squash (Feb 14), +3 more. Direct sow from: Carrots (Feb 7), Potatoes (Feb 14), Sunflowers (Feb 28). Transplant from: Calendula (Feb 14), Swiss Chard (Feb 14), Bok Choy (Feb 21), Cauliflower (Feb 21), Cosmos (Feb 28), Lavender (Feb 28), +4 more. Last frost around February 28. |
| March | Direct sow from: Beans (Mar 7), Pole Beans (Mar 7). Transplant from: Celery (Mar 7), Chives (Mar 7), Corn (Mar 7), Okra (Mar 7), Oregano (Mar 7), Parsley (Mar 7), +17 more. |
| 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 | Last sowing dates: Butternut Squash (Jul 13), Pumpkin (Jul 13), Cantaloupe (Jul 21), Celery (Jul 21), Melons (Jul 21), Spaghetti Squash (Jul 23), +4 more. |
| August | Last sowing dates: Eggplant (Aug 5), Corn (Aug 7), Sunflowers (Aug 19), Brussel Sprouts (Aug 24), Pole Beans (Aug 24), Basil (Aug 29), +4 more. |
| September | Last sowing dates: Nasturtiums (Sep 3), Okra (Sep 3), Yellow Squash (Sep 3), Zucchini (Sep 3), Cauliflower (Sep 4), Beans (Sep 5), +10 more. |
| October | Last sowing dates: Collards (Oct 3), Scallions (Oct 3), Bok Choy (Oct 4), Lettuce (Oct 4), Kale (Oct 8), Kohlrabi (Oct 8), +4 more. |
| November | Direct sow from: Garlic (Nov 25). First frost around November 25. |
| December | Start indoors: Chives (Dec 6), Lavender (Dec 6), Onion (Dec 6), Rosemary (Dec 6), Celery (Dec 20), Collards (Dec 20), +5 more. Last sowing dates: Garlic (Dec 16). |
Frequently Asked Questions
What is the last frost date for San Antonio, TX (ZIP 78228)?
The median last spring frost date for San Antonio, TX (ZIP code 78228) is around February 28. 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. One year in ten frost ends before February 6; one in ten it runs past March 23.
What is the first fall frost date in San Antonio, TX?
The median first fall frost date for San Antonio, TX is around November 25. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses. The first frost arrives around November 8 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in San Antonio, TX?
The frost-free growing season in San Antonio 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. In San Antonio (270 frost-free days, a very long season), 30 of 56 planner crops fit outright, 25 get two plantings, 1 crop is perennial.
What USDA hardiness zone is San Antonio, TX?
San Antonio, TX is in USDA hardiness zone 9a (2023 USDA Plant Hardiness Zone Map). Zones come from the average coldest winter temperature, so they tell you which perennials survive the winter; the frost dates on this page tell you when to plant.
When should I start tomatoes indoors in San Antonio, TX?
Start tomatoes indoors Jan 24 and plant out Mar 14 in San Antonio. The planner uses the local median last frost and this crop's indoor-start and transplant offsets.
How many plantings of lettuce fit in San Antonio?
Two: plant Jan 31 and again by Oct 4; both mature before Dec 2.
When do I plant garlic in San Antonio?
Nov 25 to Dec 16; it overwinters and is ready the following summer.
Can I get two tomato crops in San Antonio?
Yes: plant out Mar 14 for a summer crop, and set out a second round of transplants by Jul 26 for a fall crop.
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