Frost dates for 86535Dennehotso, AZ
The average last spring frost in Dennehotso is April 10 and the average first fall frost is November 1, giving a typical growing season of about 205 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 10
- Average first fall frost
- Nov 1
- Growing season
- 205 days
Safer after Apr 30 (1-in-10 risk)
Possible by Oct 17 (1-in-10 risk)
Last frost typically in 159 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 5 · Oct 21 · Nov 5 | 181 days | 100% |
| Frost / freeze (32°F) | Mar 20 · Apr 10 · Apr 30 | Oct 17 · Nov 1 · Nov 16 | 205 days | 100% |
| Hard freeze (28°F) | Mar 4 · Mar 25 · Apr 14 | Oct 27 · Nov 12 · Nov 26 | 229 days | 100% |
Planting calendar for Dennehotso
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 10 – May 16 |
| Tomatoes | Transplant outdoors | Apr 26 – Jul 12 |
| Peppers | Start seeds indoors | Mar 10 – Apr 10 |
| Peppers | Transplant outdoors | May 10 – Jun 10 |
| Eggplant | Start seeds indoors | Mar 27 – Apr 25 |
| Eggplant | Transplant outdoors | May 10 – Jun 10 |
| Cucumbers | Sow outdoors | May 10 – Jul 22 |
| Summer squash | Sow outdoors | Apr 26 – Jun 10 |
| Winter squash & pumpkins | Sow outdoors | May 10 – Jun 10 |
| Snap beans | Sow outdoors | Apr 26 – Aug 14 |
| Sweet corn | Sow outdoors | Apr 26 – Jul 12 |
| Watermelon & cantaloupe | Sow outdoors | May 10 – Jun 10 |
| Okra | Sow outdoors | May 3 – May 26 |
| Peas | Sow outdoors (spring) | Mar 10 – Apr 25 |
| Potatoes | Plant outdoors (spring) | Mar 10 – May 10 |
| Onions | Start seeds indoors (spring) | Jan 27 – Feb 23 |
| Onions | Transplant outdoors (spring) | Mar 27 – Apr 25 |
| Broccoli | Start seeds indoors (spring) | Feb 20 – Mar 26 |
| Broccoli | Transplant outdoors (spring) | Mar 27 – Apr 25 |
| Broccoli | Start seeds indoors (fall) | Jul 2 – Jul 12 |
| Broccoli | Transplant outdoors (fall) | Aug 1 – Aug 12 |
| Cabbage | Start seeds indoors (spring) | Feb 10 – Mar 10 |
| Cabbage | Transplant outdoors (spring) | Mar 10 – Apr 10 |
| Cabbage | Start seeds indoors (fall) | Jun 22 – Jul 22 |
| Cabbage | Transplant outdoors (fall) | Jul 22 – Aug 22 |
| Leaf lettuce | Sow outdoors (spring) | Mar 10 – May 26 |
| Leaf lettuce | Sow outdoors (fall) | Jul 22 – Sep 7 |
| Spinach | Sow outdoors (spring) | Mar 3 – Apr 16 |
| Spinach | Sow outdoors (fall) | Aug 8 – Sep 12 |
| Radishes | Sow outdoors (spring) | Mar 10 – Apr 30 |
| Radishes | Sow outdoors (fall) | Jul 22 – Sep 22 |
| Kale | Sow outdoors (spring) | Mar 27 – Apr 16 |
| Kale | Sow outdoors (fall) | Jul 15 – Aug 22 |
| Carrots | Sow outdoors (spring) | Apr 10 – May 26 |
| Carrots | Sow outdoors (fall) | Jun 22 – Aug 7 |
| Garlic | Plant outdoors (fall) | Oct 22 – Nov 22 |
Where these dates come from
ZIP code 86535 is matched to the NOAA station Monument Valley, AZ, 32.6 km away, at 5,501 ft elevation (284 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Monument Valley, AZ (used) | 5,501 ft | Apr 10 | Nov 1 |
| Mexican Hat, UT | 4,109 ft | Apr 11 | Oct 30 |
| Valley Of The Gods, UT | 5,287 ft | Mar 29 | Nov 6 |
| Betatakin, AZ | 7,286 ft | May 7 | Oct 15 |
Frost dates near Dennehotso
- Rock Point, AZ 86545 · last Apr 11, first Nov 1
- Kayenta, AZ 86033 · last Apr 10, first Nov 1
- Mexican Hat, UT 84531 · last Mar 29, first Nov 6
- 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
- Monument Valley, UT 84536 · last Apr 10, first Nov 1
- Bluff, UT 84512 · last Apr 24, first Oct 13
Frequently asked questions
- When is the last frost in Dennehotso, AZ?
- For ZIP code 86535, the average last spring frost (32°F) is April 10, based on NOAA 1991-2020 climate normals for the Monument Valley, AZ weather station. There is a 1-in-10 chance of a frost after April 30.
- When is the first frost in Dennehotso, AZ?
- The average first fall frost (32°F) is November 1. There is a 1-in-10 chance of frost by October 17, so tender plants are at risk from that point on.
- How long is the growing season in 86535?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 205 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.