Planting Dates for Arizona
Arizona's desert climate creates a unique gardening calendar — the cool season (October-March) is prime growing time in low desert areas, while northern Arizona has more traditional four-season growing.
USDA Zones 5a-10b • 120-340 frost-free days depending on location
Frost Dates in Arizona
Average last spring frost and first fall frost dates for Arizona cities. Use these to calculate your planting windows.
| City | Last Spring Frost | First Fall Frost | Frost-Free Days | USDA Zone |
|---|---|---|---|---|
| Phoenix | Feb 5 | Dec 11 | 309 | 10a |
| Tucson | Feb 28 | Nov 22 | 267 | 9b |
| Flagstaff | Jun 3 | Sep 21 | 110 | 5b |
Gardening Tips for Arizona
- ✓Phoenix area: plant cool crops October-February, warm crops February-April.
- ✓Flagstaff and northern Arizona have short, four-season growing conditions.
- ✓Shade cloth is essential during summer months in low desert gardens.
- ✓Desert soils need heavy amendment with compost — use drip irrigation exclusively.
What to Plant in Arizona
Cold-Hardy Crops (plant early)
These crops tolerate frost and can be planted 2-6 weeks before your last frost date.
30-60 days from sowing
55-70 days from sowing
60-80 days from sowing
50-70 days from sowing
55-80 days from transplant
35-50 days from sowing
20-35 days from sowing
July-August the following year
90-120 days from transplant
70-120 days from planting
50-70 days from sowing
50-60 days from sowing
Warm-Season Crops (plant after last frost)
Start these indoors and transplant after all frost danger has passed.
60-85 days from transplant
60-90 days from transplant
50-65 days from sowing
50-65 days from sowing
45-60 days from sowing
60-100 days from sowing
30-60 days from sowing
Get Exact Planting Dates for Arizona
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Frequently Asked Questions
When is the last frost date in Arizona?
Last frost dates in Arizona vary by city: Phoenix (Feb 5), Tucson (Feb 28), Flagstaff (Jun 3).
What USDA hardiness zones are in Arizona?
Arizona spans USDA hardiness zones 5a-10b. Your specific zone determines which perennials survive winter and when to start planting annuals.
What vegetables grow best in Arizona?
Hardy crops like peas, kale, spinach, and garlic thrive across Arizona. In warmer zones, tomatoes, peppers, and cucumbers do well with proper timing. Use our free calculator for exact planting dates.
How long is the growing season in Arizona?
120-340 frost-free days depending on location. Extend your season with cold frames, row covers, and indoor seed starting.
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