Frost Dates: First and last frost dates for Bartlett Dam, 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 April 6, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around March 3, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before February 9, 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° | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Last 20° | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Last 24° | Jan 19 | -- | -- | -- | -- | -- | -- | -- | -- |
| Last 28° | Feb 3 | Jan 20 | Jan 7 | Dec 24 | -- | -- | -- | -- | -- |
| Last 32° | Mar 8 | Feb 21 | Feb 10 | Feb 1 | Jan 23 | Jan 13 | Jan 2 | Dec 19 | -- |
| Last 36° | Apr 6 | Mar 25 | Mar 17 | Mar 10 | Mar 3 | Feb 24 | Feb 17 | Feb 9 | Jan 28 |
ℹ️ How to read these charts for the fall
As summer ends in Bartlett Dam, 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° | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| First 20° | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| First 24° | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| First 28° | Dec 10 | Dec 24 | Jan 6 | Jan 22 | -- | -- | -- | -- | -- |
| First 32° | Nov 19 | Nov 29 | Dec 6 | Dec 13 | Dec 19 | Dec 25 | Jan 2 | Jan 14 | -- |
| First 36° | Nov 12 | Nov 19 | Nov 25 | Nov 29 | Dec 4 | Dec 8 | Dec 13 | Dec 18 | Dec 26 |
📍 Frost Dates for other nearby locations
- Carefree, AZ 18.7 mi
- Stewart Mountain, AZ 19.2 mi
- Mormon Flat, AZ 22.5 mi
- Tempe Asu, AZ 33.8 mi
- Roosevelt, AZ 34.8 mi
- Payson, AZ 34.9 mi
- Childs, AZ 37.0 mi
- Phoenix Ap, AZ 37.3 mi
- Chandler Heights, AZ 42.5 mi
- South Phoenix, AZ 42.8 mi
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Data is provided by the NOAA National Centers for Environmental Information.