Frost and Freeze Dates
If you are relatively new to the area you might be interested in our average freeze/frost dates.
The general rule of thumb is that most plants freeze when temperatures remain at 28°F for five hours. Exceptions: seedlings (tender new leaves), often give up the ghost when temperatures dip to 32-33°F. Tropical plants have differing low-temperature thresholds.
Frost occurs when air temperatures dip below 32°F and ice crystals form on plant leaves.
Here are 2 sources of average freeze/frost dates:
This national information, by town, is based on a 30 year average. https://wrcc.dri.edu/summary/Climsmaz.html
This website has freeze/frost temperature by zip code, but I don’t know what it is based on https://davesgarden.com/guides/freeze-frost-dates/ Following is the info from this website for 86323.
Our general rule of thumb is to not put anything tender in the ground until after Mother’s Day.
Chino Valley, AZ (Yavapai county): (Zip code 86323) Source: Dave’s Garden
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
| Spring 32° | May 25 | May 18 | May 13 | May 8 | May 4 | Apr 30 | Apr 26 | Apr 21 | Apr 14 |
| Spring 28° | May 14 | May 5 | Apr 30 | Apr 24 | Apr 20 | Apr 15 | Apr 10 | Apr 4 | Mar 27 |
| Spring 24° | Apr 28 | Apr 18 | Apr 11 | Apr 5 | Mar 31 | Mar 25 | Mar 19 | Mar 12 | Mar 2 |
| Fall 32° | Oct 7 | Oct 12 | Oct 15 | Oct 18 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 3 |
| Fall 28° | Oct 13 | Oct 19 | Oct 23 | Oct 26 | Oct 29 | Oct 31 | Nov 4 | Nov 8 | Nov 13 |
| Fall 24° | Oct 27 | Oct 31 | Nov 2 | Nov 5 | Nov 8 | Nov 10 | Nov 13 | Nov 16 | Nov 21 |
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