Frost dates for 85923Clay Springs, AZ
The average last spring frost in Clay Springs is May 5 and the average first fall frost is October 15, giving a typical growing season of about 162 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 5
- Average first fall frost
- Oct 15
- Growing season
- 162 days
Safer after May 20 (1-in-10 risk)
Possible by Oct 2 (1-in-10 risk)
Last frost typically in 185 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) | May 2 · May 17 · Jun 2 | Sep 27 · Oct 7 · Oct 20 | 141 days | 100% |
| Frost / freeze (32°F) | Apr 21 · May 5 · May 20 | Oct 2 · Oct 15 · Oct 28 | 162 days | 100% |
| Hard freeze (28°F) | Apr 7 · Apr 22 · May 7 | Oct 10 · Oct 24 · Nov 8 | 184 days | 100% |
Planting calendar for Clay Springs
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 | Apr 4 – Jun 10 |
| Tomatoes | Transplant outdoors | May 21 – Jun 25 |
| Peppers | Start seeds indoors | Apr 4 – May 5 |
| Peppers | Transplant outdoors | Jun 4 – Jul 5 |
| Eggplant | Start seeds indoors | Apr 21 – May 20 |
| Eggplant | Transplant outdoors | Jun 4 – Jul 5 |
| Cucumbers | Sow outdoors | Jun 4 – Jul 5 |
| Summer squash | Sow outdoors | May 21 – Jul 5 |
| Winter squash & pumpkins | Sow outdoors | Jun 4 – Jul 5 |
| Snap beans | Sow outdoors | May 21 – Jul 28 |
| Sweet corn | Sow outdoors | May 21 – Jun 25 |
| Watermelon & cantaloupe | Sow outdoors | Jun 4 – Jul 5 |
| Okra | Sow outdoors | May 28 – Jun 20 |
| Peas | Sow outdoors (spring) | Apr 4 – May 20 |
| Potatoes | Plant outdoors (spring) | Apr 4 – Jun 4 |
| Onions | Start seeds indoors (spring) | Feb 21 – Mar 20 |
| Onions | Transplant outdoors (spring) | Apr 21 – May 20 |
| Broccoli | Start seeds indoors (spring) | Mar 17 – Apr 20 |
| Broccoli | Transplant outdoors (spring) | Apr 21 – May 20 |
| Broccoli | Start seeds indoors (fall) | Jun 15 – Jun 25 |
| Broccoli | Transplant outdoors (fall) | Jul 15 – Jul 26 |
| Cabbage | Start seeds indoors (spring) | Mar 7 – Apr 4 |
| Cabbage | Transplant outdoors (spring) | Apr 4 – May 5 |
| Cabbage | Start seeds indoors (fall) | Jun 5 – Jul 5 |
| Cabbage | Transplant outdoors (fall) | Jul 5 – Aug 5 |
| Leaf lettuce | Sow outdoors (spring) | Apr 4 – Jun 20 |
| Leaf lettuce | Sow outdoors (fall) | Jul 5 – Aug 21 |
| Spinach | Sow outdoors (spring) | Mar 28 – May 11 |
| Spinach | Sow outdoors (fall) | Jul 22 – Aug 26 |
| Radishes | Sow outdoors (spring) | Apr 4 – May 25 |
| Radishes | Sow outdoors (fall) | Jul 5 – Sep 5 |
| Kale | Sow outdoors (spring) | Apr 21 – May 11 |
| Kale | Sow outdoors (fall) | Jun 28 – Aug 5 |
| Carrots | Sow outdoors (spring) | May 5 – Jun 20 |
| Carrots | Sow outdoors (fall) | Jun 5 – Jul 21 |
| Garlic | Plant outdoors (fall) | Oct 5 – Nov 5 |
Where these dates come from
ZIP code 85923 is matched to the NOAA station Show Low Ap, AZ, 28.6 km away, at 6,411 ft elevation (109 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Show Low Ap, AZ (used) | 6,411 ft | May 5 | Oct 15 |
| Heber (Black Mesa) Rs, AZ | 6,590 ft | May 23 | Oct 5 |
| Snowflake, AZ | 5,642 ft | May 11 | Oct 10 |
| Pinetop 2E, AZ | 7,200 ft | May 22 | Oct 6 |
Frost dates near Clay Springs
- Pinedale, AZ 85934 · last May 5, first Oct 15
- White Mountain Lake, AZ 85912 · last May 5, first Oct 15
- Taylor, AZ 85939 · last May 11, first Oct 10
- Snowflake, AZ 85937 · last May 11, first Oct 10
- Overgaard, AZ 85933 · last May 23, first Oct 5
- Show Low, AZ 85902 · last May 5, first Oct 15
- Heber, AZ 85928 · last May 23, first Oct 5
- Lakeside, AZ 85929 · last May 5, first Oct 15
Frequently asked questions
- When is the last frost in Clay Springs, AZ?
- For ZIP code 85923, the average last spring frost (32°F) is May 5, based on NOAA 1991-2020 climate normals for the Show Low Ap, AZ weather station. There is a 1-in-10 chance of a frost after May 20.
- When is the first frost in Clay Springs, AZ?
- The average first fall frost (32°F) is October 15. There is a 1-in-10 chance of frost by October 2, so tender plants are at risk from that point on.
- How long is the growing season in 85923?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 162 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.