Frost dates for 85539Miami, AZ
The average last spring frost in Miami is February 24 and the average first fall frost is December 1, giving a typical growing season of about 279 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Feb 24
- Average first fall frost
- Dec 1
- Growing season
- 279 days
Safer after Mar 18 (1-in-10 risk)
Possible by Nov 15 (1-in-10 risk)
First frost typically in 35 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Feb 25 · Mar 19 · Apr 11 | Nov 2 · Nov 19 · Dec 3 | 242 days | 100% |
| Frost / freeze (32°F) | Jan 30 · Feb 24 · Mar 18 | Nov 15 · Dec 1 · Dec 15 | 279 days | 100% |
| Hard freeze (28°F) | Dec 26 · Jan 30 · Feb 28 | Nov 26 · Dec 13 · Jan 1 | 321 days | 97% |
Planting calendar for Miami
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Jan 24 – Apr 1 |
| Tomatoes | Transplant outdoors | Mar 12 – Aug 11 |
| Peppers | Start seeds indoors | Jan 24 – Feb 24 |
| Peppers | Transplant outdoors | Mar 26 – Apr 26 |
| Eggplant | Start seeds indoors | Feb 10 – Mar 11 |
| Eggplant | Transplant outdoors | Mar 26 – Apr 26 |
| Cucumbers | Sow outdoors | Mar 26 – Aug 21 |
| Summer squash | Sow outdoors | Mar 12 – Apr 26 |
| Winter squash & pumpkins | Sow outdoors | Mar 26 – Apr 26 |
| Snap beans | Sow outdoors | Mar 12 – Sep 13 |
| Sweet corn | Sow outdoors | Mar 12 – Aug 11 |
| Watermelon & cantaloupe | Sow outdoors | Mar 26 – Apr 26 |
| Okra | Sow outdoors | Mar 19 – Apr 11 |
| Peas | Sow outdoors (spring) | Jan 24 – Mar 11 |
| Potatoes | Plant outdoors (spring) | Jan 24 – Mar 26 |
| Onions | Start seeds indoors (spring) | Dec 13 – Jan 9 |
| Onions | Transplant outdoors (spring) | Feb 10 – Mar 11 |
| Broccoli | Start seeds indoors (spring) | Jan 6 – Feb 9 |
| Broccoli | Transplant outdoors (spring) | Feb 10 – Mar 11 |
| Broccoli | Start seeds indoors (fall) | Aug 1 – Aug 11 |
| Broccoli | Transplant outdoors (fall) | Aug 31 – Sep 11 |
| Cabbage | Start seeds indoors (spring) | Dec 27 – Jan 24 |
| Cabbage | Transplant outdoors (spring) | Jan 24 – Feb 24 |
| Cabbage | Start seeds indoors (fall) | Jul 22 – Aug 21 |
| Cabbage | Transplant outdoors (fall) | Aug 21 – Sep 21 |
| Leaf lettuce | Sow outdoors (spring) | Jan 24 – Apr 11 |
| Leaf lettuce | Sow outdoors (fall) | Aug 21 – Oct 7 |
| Spinach | Sow outdoors (spring) | Jan 17 – Mar 2 |
| Spinach | Sow outdoors (fall) | Sep 7 – Oct 12 |
| Radishes | Sow outdoors (spring) | Jan 24 – Mar 16 |
| Radishes | Sow outdoors (fall) | Aug 21 – Oct 22 |
| Kale | Sow outdoors (spring) | Feb 10 – Mar 2 |
| Kale | Sow outdoors (fall) | Aug 14 – Sep 21 |
| Carrots | Sow outdoors (spring) | Feb 24 – Apr 11 |
| Carrots | Sow outdoors (fall) | Jul 22 – Sep 6 |
| Garlic | Plant outdoors (fall) | Nov 21 – Dec 22 |
Where these dates come from
ZIP code 85539 is matched to the NOAA station Miami, AZ, 0.6 km away, at 3,560 ft elevation (155 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Miami, AZ (used) | 3,560 ft | Feb 24 | Dec 1 |
| Globe #3, AZ | 3,660 ft | Mar 11 | Nov 21 |
| Superior, AZ | 2,860 ft | Jan 18 | Dec 28 |
| Roosevelt 1 S, AZ | 2,605 ft | Jan 17 | Dec 25 |
Frost dates near Miami
- Claypool, AZ 85532 · last Feb 24, first Dec 1
- Globe, AZ 85501 · last Feb 24, first Dec 1
- Superior, AZ 85173 · last Jan 18, first Dec 28
- Roosevelt, AZ 85545 · last Jan 17, first Dec 25
- Kearny, AZ 85137 · last Mar 13, first Nov 19
- San Carlos, AZ 85550 · last Mar 13, first Nov 19
- Peridot, AZ 85542 · last Mar 13, first Nov 19
- Apache Junction, AZ 85117 · last Feb 11, first Dec 10
Frequently asked questions
- When is the last frost in Miami, AZ?
- For ZIP code 85539, the average last spring frost (32°F) is February 24, based on NOAA 1991-2020 climate normals for the Miami, AZ weather station. There is a 1-in-10 chance of a frost after March 18.
- When is the first frost in Miami, AZ?
- The average first fall frost (32°F) is December 1. There is a 1-in-10 chance of frost by November 15, so tender plants are at risk from that point on.
- How long is the growing season in 85539?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 279 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.