Frost Dates: First and last frost dates for Blue Ridge Rs, AZ
ℹ️ How to read these charts for the spring
As spring unfolds, the risk of frost gradually decreases each day until your tender plants are finally safe. The probabilities shown in the chart help you make smart decisions about when to plant.
While frost typically forms at 32°F, tender plants can be damaged even when temperatures are slightly higher. Air temperatures are often measured several feet above the ground, but temperatures at plant level can be several degrees colder. Protected areas like porches help by blocking radiational cooling. Given these variables, we consider 36°F the "caution zone" for frost-sensitive plants.
Key dates for your spring planting:
- By May 20, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around April 29, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before April 14, there's still an 80% risk of frost — too early for tomatoes and other tender plants unless you're prepared to protect them
If the 10-day forecast shows no temperatures below 40°F, you might safely plant earlier than the above dates suggest. Many gardeners watch for this weather window to get a head start on the growing season.
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| Last 16° | Jan 30 | Jan 4 | -- | -- | -- | -- | -- | -- | -- |
| Last 20° | Feb 14 | Jan 29 | Jan 16 | Jan 4 | Dec 22 | Dec 5 | -- | -- | -- |
| Last 24° | Mar 22 | Mar 7 | Feb 24 | Feb 15 | Feb 6 | Jan 28 | Jan 19 | Jan 7 | Dec 20 |
| Last 28° | Apr 16 | Apr 4 | Mar 27 | Mar 20 | Mar 13 | Mar 6 | Feb 27 | Feb 18 | Feb 7 |
| Last 32° | May 5 | Apr 26 | Apr 20 | Apr 15 | Apr 10 | Apr 5 | Mar 30 | Mar 24 | Mar 15 |
| Last 36° | May 20 | May 13 | May 7 | May 3 | Apr 29 | Apr 24 | Apr 20 | Apr 14 | Apr 7 |
ℹ️ How to read these charts for the fall
As summer ends in Blue Ridge Rs, AZ, nighttime temperatures begin to drop, and your risk of frost increases with each passing day. Knowing when to expect frost helps you harvest sensitive crops and extend your growing season with protection methods.
The chart below shows the probability of experiencing specific temperatures on various dates. Here's what this means for your garden:
These probabilities help you time your end-of-season harvests and know when to apply protective measures like row covers, cloches, or cold frames to extend your harvest.
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| First 16° | Dec 22 | Jan 17 | -- | -- | -- | -- | -- | -- | -- |
| First 20° | Nov 24 | Dec 7 | Dec 17 | Dec 26 | Jan 6 | Jan 21 | -- | -- | -- |
| First 24° | Nov 15 | Nov 23 | Nov 30 | Dec 5 | Dec 10 | Dec 16 | Dec 22 | Dec 30 | Jan 13 |
| First 28° | Nov 2 | Nov 9 | Nov 15 | Nov 19 | Nov 24 | Nov 28 | Dec 3 | Dec 8 | Dec 16 |
| First 32° | Oct 29 | Nov 2 | Nov 5 | Nov 8 | Nov 11 | Nov 13 | Nov 16 | Nov 19 | Nov 23 |
| First 36° | Oct 17 | Oct 22 | Oct 26 | Oct 29 | Nov 1 | Nov 5 | Nov 8 | Nov 12 | Nov 17 |
📍 Frost Dates for other nearby locations
- Prescott, AZ 15.5 mi
- Jerome, AZ 17.7 mi
- Chino Valley, AZ 23.5 mi
- Montezuma Castle Nm, AZ 26.8 mi
- Beaver Creek, AZ 31.1 mi
- Childs, AZ 37.6 mi
- Castle Hot Springs, AZ 38.4 mi
- Sedona, AZ 40.7 mi
- Walnut Creek, AZ 50.0 mi
- Williams, AZ 50.1 mi
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Data is provided by the NOAA National Centers for Environmental Information.