Frost Dates for San Tan Valley, AZ 85143
San Tan Valley has 2 ZIP codes. The San Tan Valley, AZ frost page lists all of them with their dates.
Last spring frost February 18 · First fall frost November 29 · 284 frost-free days · USDA Zone 9b
ZIP 85143 has about 44,400 people, one of 2 ZIP codes in San Tan Valley.
Very long season: 284 frost-free days. Spring frost risk spans January 15–March 23 (67 days). Fall frost risk spans November 12–December 17 (35 days).
Frost probability for 85143
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | March 23 | February 18 | January 15 |
| Fall (first frost) | November 12 | November 29 | December 17 |
Dates come from NOAA 1971–2000 freeze probabilities at FLORENCE (18.1 km away); the 50% date is the median year.
Which crops fit a 284-day season in San Tan Valley
In San Tan Valley (284 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 14 | Mar 4–Mar 11 | 242 | fits: 80 days to maturity, 242 available after Mar 4. | Jul 30 |
| Pepper | Jan 7 | Mar 4–Mar 11 | 242 | fits: 75 days to maturity, 242 available after Mar 4. | Aug 4 |
| Lettuce | Dec 24 | Jan 21–Jan 28 | 319 | two-plantings: Plant Jan 21 and again by Oct 8; both mature before Dec 6. | Oct 8 |
| Carrots | — | Jan 28–Feb 4 | 326 | fits: 70 days to maturity, 326 available after Jan 28. | Sep 27 |
| Cucumber | Jan 28 | Mar 4–Mar 11 | 256 | two-plantings: Plant Mar 4 and again by Sep 2; both mature before Nov 15. | Sep 2 |
| Beans | — | Feb 25–Mar 11 | 270 | two-plantings: Plant Feb 25 and again by Sep 9; both mature before Nov 22. | Sep 9 |
| Peas | — | Dec 24–Mar 4 | 347 | fits: 65 days to maturity, 347 available after Dec 24. | Sep 18 |
| Zucchini | Feb 4 | Mar 4–Mar 11 | 256 | two-plantings: Plant Mar 4 and again by Sep 7; both mature before Nov 15. | Sep 7 |
| Onion | Nov 26 | Jan 21–Feb 4 | 319 | fits: 100 days to maturity, 319 available after Jan 21. | — |
| Spinach | — | Dec 24–Feb 11 | 361 | two-plantings: Plant Dec 24 and again by Oct 27; both mature before Dec 20. | Oct 27 |
| Kale | Dec 10 | Jan 21–Feb 4 | 333 | two-plantings: Plant Jan 21 and again by Oct 12; both mature before Dec 20. | Oct 12 |
| Broccoli | Dec 24 | Jan 21–Feb 4 | 319 | fits: 80 days to maturity, 319 available after Jan 21. | Sep 3 |
| Cabbage | Dec 24 | Jan 21–Feb 4 | 333 | fits: 70 days to maturity, 333 available after Jan 21. | Sep 27 |
| Radish | — | Dec 24–Mar 18 | 347 | two-plantings: Plant Dec 24 and again by Oct 28; both mature before Dec 6. | Oct 28 |
| Beets | — | Dec 24–Mar 18 | 347 | two-plantings: Plant Dec 24 and again by Sep 28; both mature before Dec 6. | Sep 28 |
| Potatoes | — | Feb 4–Feb 11 | 305 | fits: 90 days to maturity, 305 available after Feb 4. | — |
| Garlic | — | Nov 29 | 389 | overwinter: Plant Nov 29 to Dec 20; harvest the following summer. | Dec 20 |
| Strawberry | — | Jan 14–Mar 11 | 340 | perennial: A perennial: plant Jan 14; it fruits from the following year and keeps producing for several years. | — |
| Corn | Jan 21 | Feb 25–Mar 4 | 256 | fits: 75 days to maturity, 256 available after Feb 25. | Aug 11 |
| Pumpkin | Feb 4 | Mar 4–Mar 4 | 249 | fits: 100 days to maturity, 249 available after Mar 4. | Jul 17 |
| Cauliflower | Jan 7 | Feb 11–Feb 25 | 298 | fits: 75 days to maturity, 298 available after Feb 11. | Sep 8 |
| Swiss Chard | Dec 24 | Feb 4–Feb 4 | 305 | two-plantings: Plant Feb 4 and again by Sep 28; both mature before Dec 6. | Sep 28 |
| Arugula | — | Dec 24–Mar 18 | 361 | two-plantings: Plant Dec 24 and again by Oct 27; both mature before Dec 20. | Oct 27 |
| Brussel Sprouts | Dec 24 | Jan 21–Feb 4 | 333 | fits: 100 days to maturity, 333 available after Jan 21. | Aug 28 |
| Butternut Squash | Feb 4 | Mar 4–Mar 11 | 249 | fits: 100 days to maturity, 249 available after Mar 4. | Jul 17 |
| Eggplant | Dec 31 | Mar 4–Mar 11 | 242 | fits: 70 days to maturity, 242 available after Mar 4. | Aug 9 |
| Okra | Jan 21 | Feb 25–Mar 4 | 263 | two-plantings: Plant Feb 25 and again by Sep 7; both mature before Nov 15. | Sep 7 |
| Basil | Jan 14 | Mar 11–Mar 11 | 249 | two-plantings: Plant Mar 11 and again by Sep 2; both mature before Nov 15. | Sep 2 |
| Cilantro | — | Jan 21–Feb 11 | 319 | two-plantings: Plant Jan 21 and again by Oct 3; both mature before Dec 6. | Oct 3 |
| Parsley | Dec 10 | Feb 25–Mar 4 | 284 | fits: 70 days to maturity, 284 available after Feb 25. | Sep 13 |
| Celery | Dec 10 | Feb 25–Mar 11 | 284 | fits: 120 days to maturity, 284 available after Feb 25. | Jul 25 |
| Scallions | Dec 10 | Jan 21–Feb 4 | 333 | two-plantings: Plant Jan 21 and again by Oct 7; both mature before Dec 20. | Oct 7 |
| Turnip | — | Jan 21–Feb 4 | 333 | two-plantings: Plant Jan 21 and again by Oct 17; both mature before Dec 20. | Oct 17 |
| Kohlrabi | — | Jan 7–Jan 21 | 347 | two-plantings: Plant Jan 7 and again by Oct 12; both mature before Dec 20. | Oct 12 |
| Bok Choy | Jan 21 | Feb 11–Feb 18 | 298 | two-plantings: Plant Feb 11 and again by Oct 8; both mature before Dec 6. | Oct 8 |
| Collards | Dec 10 | Jan 21–Feb 4 | 333 | two-plantings: Plant Jan 21 and again by Oct 7; both mature before Dec 20. | Oct 7 |
| Cantaloupe | Feb 4 | Mar 4–Mar 11 | 242 | fits: 85 days to maturity, 242 available after Mar 4. | Jul 25 |
| Chives | Nov 26 | Feb 25–Mar 4 | 298 | fits: 90 days to maturity, 298 available after Feb 25. | — |
| Dill | — | Dec 24–Mar 18 | 347 | two-plantings: Plant Dec 24 and again by Sep 28; both mature before Dec 6. | Sep 28 |
| Oregano | Dec 10 | Feb 25–Mar 4 | 298 | fits: 80 days to maturity, 298 available after Feb 25. | — |
| Rosemary | Nov 26 | Feb 25–Mar 4 | 284 | fits: 80 days to maturity, 284 available after Feb 25. | — |
| Sage | Dec 24 | Feb 25–Mar 4 | 298 | fits: 75 days to maturity, 298 available after Feb 25. | — |
| Thyme | Dec 10 | Feb 25–Mar 4 | 298 | fits: 90 days to maturity, 298 available after Feb 25. | — |
| Calendula | Jan 7 | Feb 4–Feb 18 | 305 | two-plantings: Plant Feb 4 and again by Oct 3; both mature before Dec 6. | Oct 3 |
| Cosmos | Jan 21 | Feb 18–Mar 4 | 270 | two-plantings: Plant Feb 18 and again by Sep 2; both mature before Nov 15. | Sep 2 |
| Lavender | Nov 26 | Feb 18–Mar 4 | 305 | fits: 90 days to maturity, 305 available after Feb 18. | — |
| Marigolds | Jan 7 | Feb 18–Feb 25 | 270 | two-plantings: Plant Feb 18 and again by Sep 12; both mature before Nov 15. | Sep 12 |
| Melons | Feb 4 | Mar 4–Mar 11 | 242 | fits: 85 days to maturity, 242 available after Mar 4. | Jul 25 |
| Mint | — | Feb 18–Mar 4 | 305 | fits: 90 days to maturity, 305 available after Feb 18. | — |
| Nasturtiums | Jan 21 | Feb 18–Feb 25 | 270 | two-plantings: Plant Feb 18 and again by Sep 7; both mature before Nov 15. | Sep 7 |
| Pole Beans | — | Feb 25–Mar 11 | 263 | fits: 65 days to maturity, 263 available after Feb 25. | Aug 28 |
| Spaghetti Squash | Feb 4 | Mar 4–Mar 11 | 249 | fits: 90 days to maturity, 249 available after Mar 4. | Jul 27 |
| Sunflowers | — | Feb 18–Mar 4 | 270 | fits: 70 days to maturity, 270 available after Feb 18. | Aug 23 |
| Tomatillos | Dec 24 | Feb 25–Mar 4 | 249 | fits: 75 days to maturity, 249 available after Feb 25. | Aug 4 |
| Watermelon | Feb 4 | Feb 25–Mar 4 | 249 | fits: 80 days to maturity, 249 available after Feb 25. | Jul 30 |
| Yellow Squash | Feb 4 | Mar 4–Mar 11 | 256 | two-plantings: Plant Mar 4 and again by Sep 7; both mature before Nov 15. | Sep 7 |
| Zinnias | Jan 21 | Feb 18–Mar 4 | 270 | two-plantings: Plant Feb 18 and again by Sep 2; both mature before Nov 15. | Sep 2 |
Month by month in San Tan Valley
| Month | What to do |
|---|---|
| January | Start indoors: Calendula (Jan 7), Cauliflower (Jan 7), Marigolds (Jan 7), Pepper (Jan 7), Basil (Jan 14), Tomato (Jan 14), +7 more. Direct sow from: Kohlrabi (Jan 7), Cilantro (Jan 21), Turnip (Jan 21), Carrots (Jan 28). Transplant from: Broccoli (Jan 21), Brussel Sprouts (Jan 21), Cabbage (Jan 21), Collards (Jan 21), Kale (Jan 21), Lettuce (Jan 21), +2 more. Plant: Strawberry (Jan 14). |
| February | Start indoors: Butternut Squash (Feb 4), Cantaloupe (Feb 4), Melons (Feb 4), Pumpkin (Feb 4), Spaghetti Squash (Feb 4), Watermelon (Feb 4), +2 more. Direct sow from: Potatoes (Feb 4), Sunflowers (Feb 18), Beans (Feb 25), Pole Beans (Feb 25). Transplant from: Calendula (Feb 4), Swiss Chard (Feb 4), Bok Choy (Feb 11), Cauliflower (Feb 11), Cosmos (Feb 18), Lavender (Feb 18), +15 more. Last frost around February 18. |
| March | Transplant from: Butternut Squash (Mar 4), Cantaloupe (Mar 4), Cucumber (Mar 4), Eggplant (Mar 4), Melons (Mar 4), Pepper (Mar 4), +6 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 17), Pumpkin (Jul 17), Cantaloupe (Jul 25), Celery (Jul 25), Melons (Jul 25), Spaghetti Squash (Jul 27), +2 more. |
| August | Last sowing dates: Pepper (Aug 4), Tomatillos (Aug 4), Eggplant (Aug 9), Corn (Aug 11), Sunflowers (Aug 23), Brussel Sprouts (Aug 28), +1 more. |
| September | Last sowing dates: Basil (Sep 2), Cosmos (Sep 2), Cucumber (Sep 2), Zinnias (Sep 2), Broccoli (Sep 3), Nasturtiums (Sep 7), +13 more. |
| October | Last sowing dates: Calendula (Oct 3), Cilantro (Oct 3), Collards (Oct 7), Scallions (Oct 7), Bok Choy (Oct 8), Lettuce (Oct 8), +6 more. |
| November | Start indoors: Chives (Nov 26), Lavender (Nov 26), Onion (Nov 26), Rosemary (Nov 26). Direct sow from: Garlic (Nov 29). First frost around November 29. |
| December | Start indoors: Celery (Dec 10), Collards (Dec 10), Kale (Dec 10), Oregano (Dec 10), Parsley (Dec 10), Scallions (Dec 10), +9 more. Direct sow from: Arugula (Dec 24), Beets (Dec 24), Dill (Dec 24), Peas (Dec 24), Radish (Dec 24), Spinach (Dec 24). Last sowing dates: Garlic (Dec 20). |
Frequently Asked Questions
What is the last frost date for San Tan Valley, AZ (ZIP 85143)?
The median last spring frost date for San Tan Valley, AZ (ZIP code 85143) is around February 18. 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 15; one in ten it runs past March 23.
What is the first fall frost date in San Tan Valley, AZ?
The median first fall frost date for San Tan Valley, AZ is around November 29. 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 12 in the earliest one-in-ten years, so cover tomatoes and peppers from then.
How long is the growing season in San Tan Valley, AZ?
The frost-free growing season in San Tan Valley is about 284 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 Tan Valley (284 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 Tan Valley, AZ?
San Tan Valley, AZ is in USDA hardiness zone 9b (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 Tan Valley, AZ?
Start tomatoes indoors Jan 14 and plant out Mar 4 in San Tan Valley. 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 Tan Valley?
Two: plant Jan 21 and again by Oct 8; both mature before Dec 6.
When do I plant garlic in San Tan Valley?
Nov 29 to Dec 20; it overwinters and is ready the following summer.
Can I get two tomato crops in San Tan Valley?
Yes: plant out Mar 4 for a summer crop, and set out a second round of transplants by Jul 30 for a fall crop.
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