Frost dates for 85632San Simon, AZ
The average last spring frost in San Simon is April 2 and the average first fall frost is November 7, giving a typical growing season of about 218 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 2
- Average first fall frost
- Nov 7
- Growing season
- 218 days
Safer after Apr 21 (1-in-10 risk)
Possible by Oct 23 (1-in-10 risk)
First frost typically in 11 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) | Apr 1 · Apr 18 · May 3 | Oct 14 · Oct 30 · Nov 12 | 192 days | 100% |
| Frost / freeze (32°F) | Mar 10 · Apr 2 · Apr 21 | Oct 23 · Nov 7 · Nov 21 | 218 days | 100% |
| Hard freeze (28°F) | Feb 18 · Mar 11 · Apr 8 | Nov 1 · Nov 18 · Dec 2 | 249 days | 100% |
Planting calendar for San Simon
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 | Mar 2 – May 8 |
| Tomatoes | Transplant outdoors | Apr 18 – Jul 18 |
| Peppers | Start seeds indoors | Mar 2 – Apr 2 |
| Peppers | Transplant outdoors | May 2 – Jun 2 |
| Eggplant | Start seeds indoors | Mar 19 – Apr 17 |
| Eggplant | Transplant outdoors | May 2 – Jun 2 |
| Cucumbers | Sow outdoors | May 2 – Jul 28 |
| Summer squash | Sow outdoors | Apr 18 – Jun 2 |
| Winter squash & pumpkins | Sow outdoors | May 2 – Jun 2 |
| Snap beans | Sow outdoors | Apr 18 – Aug 20 |
| Sweet corn | Sow outdoors | Apr 18 – Jul 18 |
| Watermelon & cantaloupe | Sow outdoors | May 2 – Jun 2 |
| Okra | Sow outdoors | Apr 25 – May 18 |
| Peas | Sow outdoors (spring) | Mar 2 – Apr 17 |
| Potatoes | Plant outdoors (spring) | Mar 2 – May 2 |
| Onions | Start seeds indoors (spring) | Jan 19 – Feb 15 |
| Onions | Transplant outdoors (spring) | Mar 19 – Apr 17 |
| Broccoli | Start seeds indoors (spring) | Feb 12 – Mar 18 |
| Broccoli | Transplant outdoors (spring) | Mar 19 – Apr 17 |
| Broccoli | Start seeds indoors (fall) | Jul 8 – Jul 18 |
| Broccoli | Transplant outdoors (fall) | Aug 7 – Aug 18 |
| Cabbage | Start seeds indoors (spring) | Feb 2 – Mar 2 |
| Cabbage | Transplant outdoors (spring) | Mar 2 – Apr 2 |
| Cabbage | Start seeds indoors (fall) | Jun 28 – Jul 28 |
| Cabbage | Transplant outdoors (fall) | Jul 28 – Aug 28 |
| Leaf lettuce | Sow outdoors (spring) | Mar 2 – May 18 |
| Leaf lettuce | Sow outdoors (fall) | Jul 28 – Sep 13 |
| Spinach | Sow outdoors (spring) | Feb 23 – Apr 8 |
| Spinach | Sow outdoors (fall) | Aug 14 – Sep 18 |
| Radishes | Sow outdoors (spring) | Mar 2 – Apr 22 |
| Radishes | Sow outdoors (fall) | Jul 28 – Sep 28 |
| Kale | Sow outdoors (spring) | Mar 19 – Apr 8 |
| Kale | Sow outdoors (fall) | Jul 21 – Aug 28 |
| Carrots | Sow outdoors (spring) | Apr 2 – May 18 |
| Carrots | Sow outdoors (fall) | Jun 28 – Aug 13 |
| Garlic | Plant outdoors (fall) | Oct 28 – Nov 28 |
Where these dates come from
ZIP code 85632 is matched to the NOAA station Animas 3Ese, NM, 40 km away, at 4,501 ft elevation (111 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Animas 3Ese, NM (used) | 4,501 ft | Apr 2 | Nov 7 |
| Paradise, AZ | 5,460 ft | Apr 21 | Oct 27 |
| Chiricahua Nm, AZ | 5,300 ft | Apr 16 | Nov 8 |
| Portal 4 Sw, AZ | 5,390 ft | May 3 | Oct 25 |
Frost dates near San Simon
- Animas, NM 88020 · last Apr 2, first Nov 7
- Rodeo, NM 88056 · last Apr 2, first Nov 7
- Bowie, AZ 85605 · last Apr 1, first Nov 6
- Pearce, AZ 85625 · last Apr 14, first Nov 2
- Playas, NM 88009 · last Apr 2, first Nov 7
- Lordsburg, NM 88045 · last Apr 27, first Oct 25
- Elfrida, AZ 85610 · last Apr 6, first Nov 10
- Fort Huachuca, AZ 85670 · last Apr 14, first Nov 2
Frequently asked questions
- When is the last frost in San Simon, AZ?
- For ZIP code 85632, the average last spring frost (32°F) is April 2, based on NOAA 1991-2020 climate normals for the Animas 3Ese, NM weather station. There is a 1-in-10 chance of a frost after April 21.
- When is the first frost in San Simon, AZ?
- The average first fall frost (32°F) is November 7. There is a 1-in-10 chance of frost by October 23, so tender plants are at risk from that point on.
- How long is the growing season in 85632?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 218 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.