Frost dates for 85645Amado, AZ
The average last spring frost in Amado is April 5 and the average first fall frost is November 10, giving a typical growing season of about 217 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 5
- Average first fall frost
- Nov 10
- Growing season
- 217 days
Safer after Apr 25 (1-in-10 risk)
Possible by Oct 21 (1-in-10 risk)
First frost typically in 14 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 6 · Apr 23 · May 9 | Oct 13 · Oct 30 · Nov 14 | 190 days | 100% |
| Frost / freeze (32°F) | Mar 13 · Apr 5 · Apr 25 | Oct 21 · Nov 10 · Nov 27 | 217 days | 100% |
| Hard freeze (28°F) | Feb 16 · Mar 12 · Apr 8 | Nov 1 · Nov 20 · Dec 9 | 251 days | 100% |
Planting calendar for Amado
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 5 – May 11 |
| Tomatoes | Transplant outdoors | Apr 21 – Jul 21 |
| Peppers | Start seeds indoors | Mar 5 – Apr 5 |
| Peppers | Transplant outdoors | May 5 – Jun 5 |
| Eggplant | Start seeds indoors | Mar 22 – Apr 20 |
| Eggplant | Transplant outdoors | May 5 – Jun 5 |
| Cucumbers | Sow outdoors | May 5 – Jul 31 |
| Summer squash | Sow outdoors | Apr 21 – Jun 5 |
| Winter squash & pumpkins | Sow outdoors | May 5 – Jun 5 |
| Snap beans | Sow outdoors | Apr 21 – Aug 23 |
| Sweet corn | Sow outdoors | Apr 21 – Jul 21 |
| Watermelon & cantaloupe | Sow outdoors | May 5 – Jun 5 |
| Okra | Sow outdoors | Apr 28 – May 21 |
| Peas | Sow outdoors (spring) | Mar 5 – Apr 20 |
| Potatoes | Plant outdoors (spring) | Mar 5 – May 5 |
| Onions | Start seeds indoors (spring) | Jan 22 – Feb 18 |
| Onions | Transplant outdoors (spring) | Mar 22 – Apr 20 |
| Broccoli | Start seeds indoors (spring) | Feb 15 – Mar 21 |
| Broccoli | Transplant outdoors (spring) | Mar 22 – Apr 20 |
| Broccoli | Start seeds indoors (fall) | Jul 11 – Jul 21 |
| Broccoli | Transplant outdoors (fall) | Aug 10 – Aug 21 |
| Cabbage | Start seeds indoors (spring) | Feb 5 – Mar 5 |
| Cabbage | Transplant outdoors (spring) | Mar 5 – Apr 5 |
| Cabbage | Start seeds indoors (fall) | Jul 1 – Jul 31 |
| Cabbage | Transplant outdoors (fall) | Jul 31 – Aug 31 |
| Leaf lettuce | Sow outdoors (spring) | Mar 5 – May 21 |
| Leaf lettuce | Sow outdoors (fall) | Jul 31 – Sep 16 |
| Spinach | Sow outdoors (spring) | Feb 26 – Apr 11 |
| Spinach | Sow outdoors (fall) | Aug 17 – Sep 21 |
| Radishes | Sow outdoors (spring) | Mar 5 – Apr 25 |
| Radishes | Sow outdoors (fall) | Jul 31 – Oct 1 |
| Kale | Sow outdoors (spring) | Mar 22 – Apr 11 |
| Kale | Sow outdoors (fall) | Jul 24 – Aug 31 |
| Carrots | Sow outdoors (spring) | Apr 5 – May 21 |
| Carrots | Sow outdoors (fall) | Jul 1 – Aug 16 |
| Garlic | Plant outdoors (fall) | Oct 31 – Dec 1 |
Where these dates come from
ZIP code 85645 is matched to the NOAA station Tumacacori Nm, AZ, 12.5 km away, at 3,267 ft elevation (96 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Tumacacori Nm, AZ (used) | 3,267 ft | Apr 5 | Nov 10 |
| Santa Rita Exp Range, AZ | 4,300 ft | Feb 25 | Dec 5 |
| Green Valley, AZ | 2,900 ft | Feb 25 | Nov 27 |
| Nogales 6 N, AZ | 3,461 ft | Apr 16 | Nov 2 |
Frost dates near Amado
- Tubac, AZ 85646 · last Apr 5, first Nov 10
- Tumacacori, AZ 85640 · last Apr 5, first Nov 10
- Green Valley, AZ 85622 · last Feb 25, first Nov 27
- Rio Rico, AZ 85648 · last Mar 20, first Nov 17
- Arivaca, AZ 85601 · last Mar 21, first Nov 20
- Nogales, AZ 85628 · last Mar 20, first Nov 17
- Sahuarita, AZ 85629 · last Feb 25, first Nov 27
- Tucson, AZ 85736 · last Mar 27, first Nov 9
Frequently asked questions
- When is the last frost in Amado, AZ?
- For ZIP code 85645, the average last spring frost (32°F) is April 5, based on NOAA 1991-2020 climate normals for the Tumacacori Nm, AZ weather station. There is a 1-in-10 chance of a frost after April 25.
- When is the first frost in Amado, AZ?
- The average first fall frost (32°F) is November 10. There is a 1-in-10 chance of frost by October 21, so tender plants are at risk from that point on.
- How long is the growing season in 85645?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 217 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.