Frost Dates for San Luis, AZ 85349
Last spring frost February 23 · First fall frost December 20 · 300 frost-free days · USDA Zone 10a
ZIP 85349 has about 31,300 people, the largest of 2 ZIP codes in San Luis.
Very long season: 300 frost-free days. Spring frost risk spans January 23–March 1 (37 days). Fall frost risk spans November 25–January 15 (51 days).
Frost probability for 85349
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | March 1 | February 23 | January 23 |
| Fall (first frost) | November 25 | December 20 | January 15 |
Dates come from NOAA 1971–2000 freeze probabilities at TACNA 3 NE (77.7 km away); the 50% date is the median year.
Frost dates by ZIP code in San Luis, AZ
| ZIP | Last spring frost (50%) | First fall frost (50%) | Zone |
|---|---|---|---|
| 85349 | February 23 | December 20 | 10a |
| 85336 | January 24 | December 20 | 10a |
Which crops fit a 300-day season in San Luis
In San Luis (300 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 19 | Mar 9–Mar 16 | 258 | fits: 80 days to maturity, 258 available after Mar 9. | Aug 20 |
| Pepper | Jan 12 | Mar 9–Mar 16 | 258 | fits: 75 days to maturity, 258 available after Mar 9. | Aug 25 |
| Lettuce | Dec 29 | Jan 26–Feb 2 | 335 | two-plantings: Plant Jan 26 and again by Oct 29; both mature before Dec 27. | Oct 29 |
| Carrots | — | Feb 2–Feb 9 | 342 | fits: 70 days to maturity, 342 available after Feb 2. | Oct 18 |
| Cucumber | Feb 2 | Mar 9–Mar 16 | 272 | two-plantings: Plant Mar 9 and again by Sep 23; both mature before Dec 6. | Sep 23 |
| Beans | — | Mar 2–Mar 16 | 286 | two-plantings: Plant Mar 2 and again by Sep 30; both mature before Dec 13. | Sep 30 |
| Peas | — | Dec 29–Mar 9 | 363 | fits: 65 days to maturity, 363 available after Dec 29. | Oct 9 |
| Zucchini | Feb 9 | Mar 9–Mar 16 | 272 | two-plantings: Plant Mar 9 and again by Sep 28; both mature before Dec 6. | Sep 28 |
| Onion | Dec 1 | Jan 26–Feb 9 | 335 | fits: 100 days to maturity, 335 available after Jan 26. | — |
| Spinach | — | Dec 29–Feb 16 | 377 | two-plantings: Plant Dec 29 and again by Nov 17; both mature before Jan 10. | Nov 17 |
| Kale | Dec 15 | Jan 26–Feb 9 | 349 | two-plantings: Plant Jan 26 and again by Nov 2; both mature before Jan 10. | Nov 2 |
| Broccoli | Dec 29 | Jan 26–Feb 9 | 335 | fits: 80 days to maturity, 335 available after Jan 26. | Sep 24 |
| Cabbage | Dec 29 | Jan 26–Feb 9 | 349 | fits: 70 days to maturity, 349 available after Jan 26. | Oct 18 |
| Radish | — | Dec 29–Mar 23 | 363 | two-plantings: Plant Dec 29 and again by Nov 18; both mature before Dec 27. | Nov 18 |
| Beets | — | Dec 29–Mar 23 | 363 | two-plantings: Plant Dec 29 and again by Oct 19; both mature before Dec 27. | Oct 19 |
| Potatoes | — | Feb 9–Feb 16 | 321 | fits: 90 days to maturity, 321 available after Feb 9. | — |
| Garlic | — | Dec 20 | 405 | overwinter: Plant Dec 20 to Jan 10; harvest the following summer. | Jan 10 |
| Strawberry | — | Jan 19–Mar 16 | 356 | perennial: A perennial: plant Jan 19; it fruits from the following year and keeps producing for several years. | — |
| Corn | Jan 26 | Mar 2–Mar 9 | 272 | fits: 75 days to maturity, 272 available after Mar 2. | Sep 1 |
| Pumpkin | Feb 9 | Mar 9–Mar 9 | 265 | fits: 100 days to maturity, 265 available after Mar 9. | Aug 7 |
| Cauliflower | Jan 12 | Feb 16–Mar 2 | 314 | fits: 75 days to maturity, 314 available after Feb 16. | Sep 29 |
| Swiss Chard | Dec 29 | Feb 9–Feb 9 | 321 | two-plantings: Plant Feb 9 and again by Oct 19; both mature before Dec 27. | Oct 19 |
| Arugula | — | Dec 29–Mar 23 | 377 | two-plantings: Plant Dec 29 and again by Nov 17; both mature before Jan 10. | Nov 17 |
| Brussel Sprouts | Dec 29 | Jan 26–Feb 9 | 349 | fits: 100 days to maturity, 349 available after Jan 26. | Sep 18 |
| Butternut Squash | Feb 9 | Mar 9–Mar 16 | 265 | fits: 100 days to maturity, 265 available after Mar 9. | Aug 7 |
| Eggplant | Jan 5 | Mar 9–Mar 16 | 258 | fits: 70 days to maturity, 258 available after Mar 9. | Aug 30 |
| Okra | Jan 26 | Mar 2–Mar 9 | 279 | two-plantings: Plant Mar 2 and again by Sep 28; both mature before Dec 6. | Sep 28 |
| Basil | Jan 19 | Mar 16–Mar 16 | 265 | two-plantings: Plant Mar 16 and again by Sep 23; both mature before Dec 6. | Sep 23 |
| Cilantro | — | Jan 26–Feb 16 | 335 | two-plantings: Plant Jan 26 and again by Oct 24; both mature before Dec 27. | Oct 24 |
| Parsley | Dec 15 | Mar 2–Mar 9 | 300 | fits: 70 days to maturity, 300 available after Mar 2. | Oct 4 |
| Celery | Dec 15 | Mar 2–Mar 16 | 300 | fits: 120 days to maturity, 300 available after Mar 2. | Aug 15 |
| Scallions | Dec 15 | Jan 26–Feb 9 | 349 | two-plantings: Plant Jan 26 and again by Oct 28; both mature before Jan 10. | Oct 28 |
| Turnip | — | Jan 26–Feb 9 | 349 | two-plantings: Plant Jan 26 and again by Nov 7; both mature before Jan 10. | Nov 7 |
| Kohlrabi | — | Jan 12–Jan 26 | 363 | two-plantings: Plant Jan 12 and again by Nov 2; both mature before Jan 10. | Nov 2 |
| Bok Choy | Jan 26 | Feb 16–Feb 23 | 314 | two-plantings: Plant Feb 16 and again by Oct 29; both mature before Dec 27. | Oct 29 |
| Collards | Dec 15 | Jan 26–Feb 9 | 349 | two-plantings: Plant Jan 26 and again by Oct 28; both mature before Jan 10. | Oct 28 |
| Cantaloupe | Feb 9 | Mar 9–Mar 16 | 258 | fits: 85 days to maturity, 258 available after Mar 9. | Aug 15 |
| Chives | Dec 1 | Mar 2–Mar 9 | 314 | fits: 90 days to maturity, 314 available after Mar 2. | — |
| Dill | — | Dec 29–Mar 23 | 363 | two-plantings: Plant Dec 29 and again by Oct 19; both mature before Dec 27. | Oct 19 |
| Oregano | Dec 15 | Mar 2–Mar 9 | 314 | fits: 80 days to maturity, 314 available after Mar 2. | — |
| Rosemary | Dec 1 | Mar 2–Mar 9 | 300 | fits: 80 days to maturity, 300 available after Mar 2. | — |
| Sage | Dec 29 | Mar 2–Mar 9 | 314 | fits: 75 days to maturity, 314 available after Mar 2. | — |
| Thyme | Dec 15 | Mar 2–Mar 9 | 314 | fits: 90 days to maturity, 314 available after Mar 2. | — |
| Calendula | Jan 12 | Feb 9–Feb 23 | 321 | two-plantings: Plant Feb 9 and again by Oct 24; both mature before Dec 27. | Oct 24 |
| Cosmos | Jan 26 | Feb 23–Mar 9 | 286 | two-plantings: Plant Feb 23 and again by Sep 23; both mature before Dec 6. | Sep 23 |
| Lavender | Dec 1 | Feb 23–Mar 9 | 321 | fits: 90 days to maturity, 321 available after Feb 23. | — |
| Marigolds | Jan 12 | Feb 23–Mar 2 | 286 | two-plantings: Plant Feb 23 and again by Oct 3; both mature before Dec 6. | Oct 3 |
| Melons | Feb 9 | Mar 9–Mar 16 | 258 | fits: 85 days to maturity, 258 available after Mar 9. | Aug 15 |
| Mint | — | Feb 23–Mar 9 | 321 | fits: 90 days to maturity, 321 available after Feb 23. | — |
| Nasturtiums | Jan 26 | Feb 23–Mar 2 | 286 | two-plantings: Plant Feb 23 and again by Sep 28; both mature before Dec 6. | Sep 28 |
| Pole Beans | — | Mar 2–Mar 16 | 279 | fits: 65 days to maturity, 279 available after Mar 2. | Sep 18 |
| Spaghetti Squash | Feb 9 | Mar 9–Mar 16 | 265 | fits: 90 days to maturity, 265 available after Mar 9. | Aug 17 |
| Sunflowers | — | Feb 23–Mar 9 | 286 | fits: 70 days to maturity, 286 available after Feb 23. | Sep 13 |
| Tomatillos | Dec 29 | Mar 2–Mar 9 | 265 | fits: 75 days to maturity, 265 available after Mar 2. | Aug 25 |
| Watermelon | Feb 9 | Mar 2–Mar 9 | 265 | fits: 80 days to maturity, 265 available after Mar 2. | Aug 20 |
| Yellow Squash | Feb 9 | Mar 9–Mar 16 | 272 | two-plantings: Plant Mar 9 and again by Sep 28; both mature before Dec 6. | Sep 28 |
| Zinnias | Jan 26 | Feb 23–Mar 9 | 286 | two-plantings: Plant Feb 23 and again by Sep 23; both mature before Dec 6. | Sep 23 |
Month by month in San Luis
| Month | What to do |
|---|---|
| January | Start indoors: Eggplant (Jan 5), Calendula (Jan 12), Cauliflower (Jan 12), Marigolds (Jan 12), Pepper (Jan 12), Basil (Jan 19), +7 more. Direct sow from: Kohlrabi (Jan 12), Cilantro (Jan 26), Turnip (Jan 26). Transplant from: Broccoli (Jan 26), Brussel Sprouts (Jan 26), Cabbage (Jan 26), Collards (Jan 26), Kale (Jan 26), Lettuce (Jan 26), +2 more. Plant: Strawberry (Jan 19). Last sowing dates: Garlic (Jan 10). |
| February | Start indoors: Cucumber (Feb 2), Butternut Squash (Feb 9), Cantaloupe (Feb 9), Melons (Feb 9), Pumpkin (Feb 9), Spaghetti Squash (Feb 9), +3 more. Direct sow from: Carrots (Feb 2), Potatoes (Feb 9), Sunflowers (Feb 23). Transplant from: Calendula (Feb 9), Swiss Chard (Feb 9), Bok Choy (Feb 16), Cauliflower (Feb 16), Cosmos (Feb 23), Lavender (Feb 23), +4 more. Last frost around February 23. |
| March | Direct sow from: Beans (Mar 2), Pole Beans (Mar 2). Transplant from: Celery (Mar 2), Chives (Mar 2), Corn (Mar 2), Okra (Mar 2), Oregano (Mar 2), Parsley (Mar 2), +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 | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| August | Last sowing dates: Butternut Squash (Aug 7), Pumpkin (Aug 7), Cantaloupe (Aug 15), Celery (Aug 15), Melons (Aug 15), Spaghetti Squash (Aug 17), +5 more. |
| September | Last sowing dates: Corn (Sep 1), Sunflowers (Sep 13), Brussel Sprouts (Sep 18), Pole Beans (Sep 18), Basil (Sep 23), Cosmos (Sep 23), +9 more. |
| October | Last sowing dates: Marigolds (Oct 3), Parsley (Oct 4), Peas (Oct 9), Cabbage (Oct 18), Carrots (Oct 18), Beets (Oct 19), +8 more. |
| November | Last sowing dates: Kale (Nov 2), Kohlrabi (Nov 2), Turnip (Nov 7), Arugula (Nov 17), Spinach (Nov 17), Radish (Nov 18). |
| December | Start indoors: Chives (Dec 1), Lavender (Dec 1), Onion (Dec 1), Rosemary (Dec 1), Celery (Dec 15), Collards (Dec 15), +12 more. Direct sow from: Garlic (Dec 20), Arugula (Dec 29), Beets (Dec 29), Dill (Dec 29), Peas (Dec 29), Radish (Dec 29), +1 more. First frost around December 20. |
Frequently Asked Questions
What is the last frost date for San Luis, AZ (ZIP 85349)?
The median last spring frost date for San Luis, AZ (ZIP code 85349) is around February 23. 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 January 23; one in ten it runs past March 1.
What is the first fall frost date in San Luis, AZ?
The median first fall frost date for San Luis, AZ is around December 20. 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 25 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in San Luis, AZ?
The frost-free growing season in San Luis is about 300 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 Luis (300 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 Luis, AZ?
San Luis, AZ is in USDA hardiness zone 10a (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 Luis, AZ?
Start tomatoes indoors Jan 19 and plant out Mar 9 in San Luis. 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 Luis?
Two: plant Jan 26 and again by Oct 29; both mature before Dec 27.
When do I plant garlic in San Luis?
Dec 20 to Jan 10; it overwinters and is ready the following summer.
Can I get two tomato crops in San Luis?
Yes: plant out Mar 9 for a summer crop, and set out a second round of transplants by Aug 20 for a fall crop.
Which nearby ZIP has a longer season?
Brawley (ZIP 92227) has 351 frost-free days, 51 more than San Luis (ZIP 85349). See Brawley ZIP 92227 frost dates
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