Frost Dates for Mesa, AZ 85215
Mesa has 13 ZIP codes. The Mesa, AZ frost page lists all of them with their dates.
Last spring frost January 26 · First fall frost December 19 · 327 frost-free days · USDA Zone 9b
Frost probability for 85215
| Frost | 10% | 50% | 90% |
|---|---|---|---|
| Spring (last frost) | March 17 | January 26 | — |
| Fall (first frost) | November 19 | December 19 | — |
Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (13.7 km away); the 50% date is the median year.
Month by month in Mesa
| Month | What to do |
|---|---|
| January | Last frost around January 26. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings. |
| February | Frost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini. |
| March | Succession plant lettuce and greens. Keep beds weeded and watered consistently. |
| April | Harvest regularly to encourage production. Monitor for pests and disease. |
| May | Midsummer: harvest beans, zucchini, cucumbers. Start brassica seeds indoors for fall. |
| June | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| July | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| August | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| September | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| October | Direct sow carrots and beets for fall harvest. Start fall broccoli and kale indoors. |
| November | First fall frost approaching (around December 19). Transplant fall brassicas. Sow spinach, arugula, and radishes. |
| December | First frost around December 19. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season. |
What grows in a 327-day season
Frequently Asked Questions
What is the last frost date for Mesa, AZ (ZIP 85215)?
The median last spring frost date for Mesa, AZ (ZIP code 85215) is around January 26. 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.
What is the first fall frost date in Mesa, AZ?
The median first fall frost date for Mesa, AZ is around December 19. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.
How long is the growing season in Mesa, AZ?
The frost-free growing season in Mesa is about 327 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.
What USDA hardiness zone is Mesa, AZ?
Based on frost date patterns, Mesa falls approximately in 9b. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.
When should I start tomatoes indoors in Mesa, AZ?
Start tomato seeds indoors 6–8 weeks before your last frost date (around January 26). For Mesa, that's roughly December 1 to December 15. Transplant outdoors 1–2 weeks after your last frost.
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- When to plant in Mesa, AZ: month-by-month guide
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