ZIP 85001 · Phoenix, AZ · USDA zone 10a
Your Phoenix calendar has a 313-day estimated frost-free season. This estimate uses the representative Phoenix frost station, USDA zone 10a, and tomatoes timing rules.
| Signal | Value | Why it matters |
|---|---|---|
| Last frost estimate | February 5, 2026 | Warm-season transplant risk starts falling after this window. |
| First frost estimate | December 15, 2026 | Fall planting counts backward from this date. |
| Season length | 313 days | Longer seasons can support succession crops. |
| Spacing | 18-24 in | Airflow and root space affect yield. |
| Soil temperature | 60 F+ | Seeds and transplants stall in cold soil. |
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Local data
Phoenix frost history and USDA zone 10a shift the safe planting window. GrowZone uses a local representative station instead of one national rule.
University of Arizona Extension is the kind of local source to verify against when a crop is expensive, weather is unusual, or your yard has a cold pocket.
Crop note
Harden seedlings off for a week before transplanting. Tomatoes prefers full sun, 18-24 in spacing, and soil near 60 F+.
For fall, count backward from Dec 15. A conservative last sowing target is around Sep 28.