Frost dates for 86545Rock Point, AZ
The average last spring frost in Rock Point is April 11 and the average first fall frost is November 1, giving a typical growing season of about 200 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 11
- Average first fall frost
- Nov 1
- Growing season
- 200 days
Safer after May 2 (1-in-10 risk)
Possible by Oct 16 (1-in-10 risk)
First frost typically in 5 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 10 · Apr 27 · May 17 | Oct 5 · Oct 21 · Nov 2 | 174 days | 100% |
| Frost / freeze (32°F) | Mar 24 · Apr 11 · May 2 | Oct 16 · Nov 1 · Nov 12 | 200 days | 100% |
| Hard freeze (28°F) | Mar 4 · Mar 26 · Apr 13 | Oct 27 · Nov 9 · Nov 21 | 226 days | 100% |
Planting calendar for Rock Point
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 11 – May 17 |
| Tomatoes | Transplant outdoors | Apr 27 – Jul 12 |
| Peppers | Start seeds indoors | Mar 11 – Apr 11 |
| Peppers | Transplant outdoors | May 11 – Jun 11 |
| Eggplant | Start seeds indoors | Mar 28 – Apr 26 |
| Eggplant | Transplant outdoors | May 11 – Jun 11 |
| Cucumbers | Sow outdoors | May 11 – Jul 22 |
| Summer squash | Sow outdoors | Apr 27 – Jun 11 |
| Winter squash & pumpkins | Sow outdoors | May 11 – Jun 11 |
| Snap beans | Sow outdoors | Apr 27 – Aug 14 |
| Sweet corn | Sow outdoors | Apr 27 – Jul 12 |
| Watermelon & cantaloupe | Sow outdoors | May 11 – Jun 11 |
| Okra | Sow outdoors | May 4 – May 27 |
| Peas | Sow outdoors (spring) | Mar 11 – Apr 26 |
| Potatoes | Plant outdoors (spring) | Mar 11 – May 11 |
| Onions | Start seeds indoors (spring) | Jan 28 – Feb 24 |
| Onions | Transplant outdoors (spring) | Mar 28 – Apr 26 |
| Broccoli | Start seeds indoors (spring) | Feb 21 – Mar 27 |
| Broccoli | Transplant outdoors (spring) | Mar 28 – Apr 26 |
| Broccoli | Start seeds indoors (fall) | Jul 2 – Jul 12 |
| Broccoli | Transplant outdoors (fall) | Aug 1 – Aug 12 |
| Cabbage | Start seeds indoors (spring) | Feb 11 – Mar 11 |
| Cabbage | Transplant outdoors (spring) | Mar 11 – Apr 11 |
| Cabbage | Start seeds indoors (fall) | Jun 22 – Jul 22 |
| Cabbage | Transplant outdoors (fall) | Jul 22 – Aug 22 |
| Leaf lettuce | Sow outdoors (spring) | Mar 11 – May 27 |
| Leaf lettuce | Sow outdoors (fall) | Jul 22 – Sep 7 |
| Spinach | Sow outdoors (spring) | Mar 4 – Apr 17 |
| Spinach | Sow outdoors (fall) | Aug 8 – Sep 12 |
| Radishes | Sow outdoors (spring) | Mar 11 – May 1 |
| Radishes | Sow outdoors (fall) | Jul 22 – Sep 22 |
| Kale | Sow outdoors (spring) | Mar 28 – Apr 17 |
| Kale | Sow outdoors (fall) | Jul 15 – Aug 22 |
| Carrots | Sow outdoors (spring) | Apr 11 – May 27 |
| Carrots | Sow outdoors (fall) | Jun 22 – Aug 7 |
| Garlic | Plant outdoors (fall) | Oct 22 – Nov 22 |
Where these dates come from
ZIP code 86545 is matched to the NOAA station Teec Nos Pos, AZ, 52.9 km away, at 5,290 ft elevation (280 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Teec Nos Pos, AZ (used) | 5,290 ft | Apr 11 | Nov 1 |
| Lukachukai, AZ | 6,520 ft | May 3 | Oct 17 |
| Mexican Hat, UT | 4,109 ft | Apr 11 | Oct 30 |
| Monument Valley, AZ | 5,501 ft | Apr 10 | Nov 1 |
Frost dates near Rock Point
- Dennehotso, AZ 86535 · last Apr 10, first Nov 1
- Teec Nos Pos, AZ 86514 · last Apr 11, first Nov 1
- Round Rock, AZ 86547 · last May 6, first Oct 8
- Many Farms, AZ 86538 · last May 6, first Oct 8
- Lukachukai, AZ 86507 · last May 3, first Oct 17
- Mexican Hat, UT 84531 · last Mar 29, first Nov 6
- Kayenta, AZ 86033 · last Apr 10, first Nov 1
- Tsaile, AZ 86556 · last May 3, first Oct 17
Frequently asked questions
- When is the last frost in Rock Point, AZ?
- For ZIP code 86545, the average last spring frost (32°F) is April 11, based on NOAA 1991-2020 climate normals for the Teec Nos Pos, AZ weather station. There is a 1-in-10 chance of a frost after May 2.
- When is the first frost in Rock Point, AZ?
- The average first fall frost (32°F) is November 1. There is a 1-in-10 chance of frost by October 16, so tender plants are at risk from that point on.
- How long is the growing season in 86545?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 200 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.