Frost Dates for San Antonio, TX 78220
San Antonio has 59 ZIP codes. The San Antonio, TX frost page lists all of them with their dates.
Last spring frost March 4 · First fall frost November 21 · 262 frost-free days · USDA Zone 9a
ZIP 78220 has about 19,400 people, one of 59 ZIP codes in San Antonio.
Very long season: 262 frost-free days. Spring frost risk spans February 8–March 29 (49 days). Fall frost risk spans October 31–December 12 (42 days).
Frost probability for 78220
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | March 29 | March 4 | February 8 |
| Fall (first frost) | October 31 | November 21 | December 12 |
Dates come from NOAA 1971–2000 freeze probabilities at NEW BRAUNFELS (35.8 km away); the 50% date is the median year.
Which crops fit a 262-day season in San Antonio
In San Antonio (262 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 28 | Mar 18–Mar 25 | 220 | fits: 80 days to maturity, 220 available after Mar 18. | Jul 22 |
| Pepper | Jan 21 | Mar 18–Mar 25 | 220 | fits: 75 days to maturity, 220 available after Mar 18. | Jul 27 |
| Lettuce | Jan 7 | Feb 4–Feb 11 | 297 | two-plantings: Plant Feb 4 and again by Sep 30; both mature before Nov 28. | Sep 30 |
| Carrots | — | Feb 11–Feb 18 | 304 | fits: 70 days to maturity, 304 available after Feb 11. | Sep 19 |
| Cucumber | Feb 11 | Mar 18–Mar 25 | 234 | two-plantings: Plant Mar 18 and again by Aug 25; both mature before Nov 7. | Aug 25 |
| Beans | — | Mar 11–Mar 25 | 248 | two-plantings: Plant Mar 11 and again by Sep 1; both mature before Nov 14. | Sep 1 |
| Peas | — | Jan 7–Mar 18 | 325 | fits: 65 days to maturity, 325 available after Jan 7. | Sep 10 |
| Zucchini | Feb 18 | Mar 18–Mar 25 | 234 | two-plantings: Plant Mar 18 and again by Aug 30; both mature before Nov 7. | Aug 30 |
| Onion | Dec 10 | Feb 4–Feb 18 | 297 | fits: 100 days to maturity, 297 available after Feb 4. | — |
| Spinach | — | Jan 7–Feb 25 | 339 | two-plantings: Plant Jan 7 and again by Oct 19; both mature before Dec 12. | Oct 19 |
| Kale | Dec 24 | Feb 4–Feb 18 | 311 | two-plantings: Plant Feb 4 and again by Oct 4; both mature before Dec 12. | Oct 4 |
| Broccoli | Jan 7 | Feb 4–Feb 18 | 297 | fits: 80 days to maturity, 297 available after Feb 4. | Aug 26 |
| Cabbage | Jan 7 | Feb 4–Feb 18 | 311 | fits: 70 days to maturity, 311 available after Feb 4. | Sep 19 |
| Radish | — | Jan 7–Apr 1 | 325 | two-plantings: Plant Jan 7 and again by Oct 20; both mature before Nov 28. | Oct 20 |
| Beets | — | Jan 7–Apr 1 | 325 | two-plantings: Plant Jan 7 and again by Sep 20; both mature before Nov 28. | Sep 20 |
| Potatoes | — | Feb 18–Feb 25 | 283 | fits: 90 days to maturity, 283 available after Feb 18. | — |
| Garlic | — | Nov 21 | 367 | overwinter: Plant Nov 21 to Dec 12; harvest the following summer. | Dec 12 |
| Strawberry | — | Jan 28–Mar 25 | 318 | perennial: A perennial: plant Jan 28; it fruits from the following year and keeps producing for several years. | — |
| Corn | Feb 4 | Mar 11–Mar 18 | 234 | fits: 75 days to maturity, 234 available after Mar 11. | Aug 3 |
| Pumpkin | Feb 18 | Mar 18–Mar 18 | 227 | fits: 100 days to maturity, 227 available after Mar 18. | Jul 9 |
| Cauliflower | Jan 21 | Feb 25–Mar 11 | 276 | fits: 75 days to maturity, 276 available after Feb 25. | Aug 31 |
| Swiss Chard | Jan 7 | Feb 18–Feb 18 | 283 | two-plantings: Plant Feb 18 and again by Sep 20; both mature before Nov 28. | Sep 20 |
| Arugula | — | Jan 7–Apr 1 | 339 | two-plantings: Plant Jan 7 and again by Oct 19; both mature before Dec 12. | Oct 19 |
| Brussel Sprouts | Jan 7 | Feb 4–Feb 18 | 311 | fits: 100 days to maturity, 311 available after Feb 4. | Aug 20 |
| Butternut Squash | Feb 18 | Mar 18–Mar 25 | 227 | fits: 100 days to maturity, 227 available after Mar 18. | Jul 9 |
| Eggplant | Jan 14 | Mar 18–Mar 25 | 220 | fits: 70 days to maturity, 220 available after Mar 18. | Aug 1 |
| Okra | Feb 4 | Mar 11–Mar 18 | 241 | two-plantings: Plant Mar 11 and again by Aug 30; both mature before Nov 7. | Aug 30 |
| Basil | Jan 28 | Mar 25–Mar 25 | 227 | two-plantings: Plant Mar 25 and again by Aug 25; both mature before Nov 7. | Aug 25 |
| Cilantro | — | Feb 4–Feb 25 | 297 | two-plantings: Plant Feb 4 and again by Sep 25; both mature before Nov 28. | Sep 25 |
| Parsley | Dec 24 | Mar 11–Mar 18 | 262 | fits: 70 days to maturity, 262 available after Mar 11. | Sep 5 |
| Celery | Dec 24 | Mar 11–Mar 25 | 262 | fits: 120 days to maturity, 262 available after Mar 11. | Jul 17 |
| Scallions | Dec 24 | Feb 4–Feb 18 | 311 | two-plantings: Plant Feb 4 and again by Sep 29; both mature before Dec 12. | Sep 29 |
| Turnip | — | Feb 4–Feb 18 | 311 | two-plantings: Plant Feb 4 and again by Oct 9; both mature before Dec 12. | Oct 9 |
| Kohlrabi | — | Jan 21–Feb 4 | 325 | two-plantings: Plant Jan 21 and again by Oct 4; both mature before Dec 12. | Oct 4 |
| Bok Choy | Feb 4 | Feb 25–Mar 4 | 276 | two-plantings: Plant Feb 25 and again by Sep 30; both mature before Nov 28. | Sep 30 |
| Collards | Dec 24 | Feb 4–Feb 18 | 311 | two-plantings: Plant Feb 4 and again by Sep 29; both mature before Dec 12. | Sep 29 |
| Cantaloupe | Feb 18 | Mar 18–Mar 25 | 220 | fits: 85 days to maturity, 220 available after Mar 18. | Jul 17 |
| Chives | Dec 10 | Mar 11–Mar 18 | 276 | fits: 90 days to maturity, 276 available after Mar 11. | — |
| Dill | — | Jan 7–Apr 1 | 325 | two-plantings: Plant Jan 7 and again by Sep 20; both mature before Nov 28. | Sep 20 |
| Oregano | Dec 24 | Mar 11–Mar 18 | 276 | fits: 80 days to maturity, 276 available after Mar 11. | — |
| Rosemary | Dec 10 | Mar 11–Mar 18 | 262 | fits: 80 days to maturity, 262 available after Mar 11. | — |
| Sage | Jan 7 | Mar 11–Mar 18 | 276 | fits: 75 days to maturity, 276 available after Mar 11. | — |
| Thyme | Dec 24 | Mar 11–Mar 18 | 276 | fits: 90 days to maturity, 276 available after Mar 11. | — |
| Calendula | Jan 21 | Feb 18–Mar 4 | 283 | two-plantings: Plant Feb 18 and again by Sep 25; both mature before Nov 28. | Sep 25 |
| Cosmos | Feb 4 | Mar 4–Mar 18 | 248 | two-plantings: Plant Mar 4 and again by Aug 25; both mature before Nov 7. | Aug 25 |
| Lavender | Dec 10 | Mar 4–Mar 18 | 283 | fits: 90 days to maturity, 283 available after Mar 4. | — |
| Marigolds | Jan 21 | Mar 4–Mar 11 | 248 | two-plantings: Plant Mar 4 and again by Sep 4; both mature before Nov 7. | Sep 4 |
| Melons | Feb 18 | Mar 18–Mar 25 | 220 | fits: 85 days to maturity, 220 available after Mar 18. | Jul 17 |
| Mint | — | Mar 4–Mar 18 | 283 | fits: 90 days to maturity, 283 available after Mar 4. | — |
| Nasturtiums | Feb 4 | Mar 4–Mar 11 | 248 | two-plantings: Plant Mar 4 and again by Aug 30; both mature before Nov 7. | Aug 30 |
| Pole Beans | — | Mar 11–Mar 25 | 241 | fits: 65 days to maturity, 241 available after Mar 11. | Aug 20 |
| Spaghetti Squash | Feb 18 | Mar 18–Mar 25 | 227 | fits: 90 days to maturity, 227 available after Mar 18. | Jul 19 |
| Sunflowers | — | Mar 4–Mar 18 | 248 | fits: 70 days to maturity, 248 available after Mar 4. | Aug 15 |
| Tomatillos | Jan 7 | Mar 11–Mar 18 | 227 | fits: 75 days to maturity, 227 available after Mar 11. | Jul 27 |
| Watermelon | Feb 18 | Mar 11–Mar 18 | 227 | fits: 80 days to maturity, 227 available after Mar 11. | Jul 22 |
| Yellow Squash | Feb 18 | Mar 18–Mar 25 | 234 | two-plantings: Plant Mar 18 and again by Aug 30; both mature before Nov 7. | Aug 30 |
| Zinnias | Feb 4 | Mar 4–Mar 18 | 248 | two-plantings: Plant Mar 4 and again by Aug 25; both mature before Nov 7. | Aug 25 |
Month by month in San Antonio
| Month | What to do |
|---|---|
| January | Start indoors: Broccoli (Jan 7), Brussel Sprouts (Jan 7), Cabbage (Jan 7), Lettuce (Jan 7), Sage (Jan 7), Swiss Chard (Jan 7), +8 more. Direct sow from: Arugula (Jan 7), Beets (Jan 7), Dill (Jan 7), Peas (Jan 7), Radish (Jan 7), Spinach (Jan 7), +1 more. Plant: Strawberry (Jan 28). |
| February | Start indoors: Bok Choy (Feb 4), Corn (Feb 4), Cosmos (Feb 4), Nasturtiums (Feb 4), Okra (Feb 4), Zinnias (Feb 4), +9 more. Direct sow from: Cilantro (Feb 4), Turnip (Feb 4), Carrots (Feb 11), Potatoes (Feb 18). Transplant from: Broccoli (Feb 4), Brussel Sprouts (Feb 4), Cabbage (Feb 4), Collards (Feb 4), Kale (Feb 4), Lettuce (Feb 4), +6 more. |
| March | Direct sow from: Sunflowers (Mar 4), Beans (Mar 11), Pole Beans (Mar 11). Transplant from: Cosmos (Mar 4), Lavender (Mar 4), Marigolds (Mar 4), Mint (Mar 4), Nasturtiums (Mar 4), Zinnias (Mar 4), +23 more. Last frost around March 4. |
| April | Frost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini. |
| May | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| June | Harvest regularly to encourage production. Monitor for pests and disease. |
| July | Last sowing dates: Butternut Squash (Jul 9), Pumpkin (Jul 9), Cantaloupe (Jul 17), Celery (Jul 17), Melons (Jul 17), Spaghetti Squash (Jul 19), +4 more. |
| August | Last sowing dates: Eggplant (Aug 1), Corn (Aug 3), Sunflowers (Aug 15), Brussel Sprouts (Aug 20), Pole Beans (Aug 20), Basil (Aug 25), +9 more. |
| September | Last sowing dates: Beans (Sep 1), Marigolds (Sep 4), Parsley (Sep 5), Peas (Sep 10), Cabbage (Sep 19), Carrots (Sep 19), +9 more. |
| October | Last sowing dates: Kale (Oct 4), Kohlrabi (Oct 4), Turnip (Oct 9), Arugula (Oct 19), Spinach (Oct 19), Radish (Oct 20). |
| November | Direct sow from: Garlic (Nov 21). First frost around November 21. |
| December | Start indoors: Chives (Dec 10), Lavender (Dec 10), Onion (Dec 10), Rosemary (Dec 10), Celery (Dec 24), Collards (Dec 24), +5 more. Last sowing dates: Garlic (Dec 12). |
Frequently Asked Questions
What is the last frost date for San Antonio, TX (ZIP 78220)?
The median last spring frost date for San Antonio, TX (ZIP code 78220) 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. One year in ten frost ends before February 8; one in ten it runs past March 29.
What is the first fall frost date in San Antonio, TX?
The median first fall frost date for San Antonio, 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. The first frost arrives around October 31 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 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. In San Antonio (262 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 28 and plant out Mar 18 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 Feb 4 and again by Sep 30; both mature before Nov 28.
When do I plant garlic in San Antonio?
Nov 21 to Dec 12; it overwinters and is ready the following summer.
Can I get two tomato crops in San Antonio?
Yes: plant out Mar 18 for a summer crop, and set out a second round of transplants by Jul 22 for a fall crop.
Which nearby ZIP has a longer season?
Universal City (ZIP 78148) has 270 frost-free days, 8 more than San Antonio (ZIP 78220). See Universal City ZIP 78148 frost dates
Nearby and related
- Frost dates for San Antonio, TX 78244 (5.4 mi)
- Frost dates for Converse, TX 78109 (8 mi)
- Frost dates for Universal City, TX 78148 (11 mi)
- Frost dates for Schertz, TX 78154 (12.4 mi)
- Frost dates for San Antonio, TX 78238 (13.7 mi)
- When to plant in San Antonio, TX: month-by-month guide
- When to plant in TX
- When to plant Peppers in TX
- When to plant Cucumbers in TX
- When to plant Zucchini in TX
- When to plant Butternut Squash in TX
- When to plant Basil in TX
- When to plant Sweet Corn in TX
- Look up another ZIP