Frost Dates: First and last frost dates for Blanca, CO
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 July 9, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around June 21, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before June 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° | May 6 | Apr 29 | Apr 24 | Apr 19 | Apr 15 | Apr 11 | Apr 6 | Apr 1 | Mar 25 |
| Last 20° | May 11 | May 5 | Apr 30 | Apr 26 | Apr 23 | Apr 19 | Apr 15 | Apr 11 | Apr 4 |
| Last 24° | May 21 | May 16 | May 13 | May 10 | May 7 | May 4 | May 1 | Apr 27 | Apr 22 |
| Last 28° | Jun 5 | May 30 | May 26 | May 23 | May 20 | May 16 | May 13 | May 9 | May 3 |
| Last 32° | Jun 22 | Jun 17 | Jun 13 | Jun 9 | Jun 6 | Jun 3 | May 31 | May 27 | May 22 |
| Last 36° | Jul 9 | Jul 2 | Jun 28 | Jun 24 | Jun 21 | Jun 17 | Jun 13 | Jun 9 | Jun 3 |
ℹ️ How to read these charts for the fall
As summer ends in Blanca, CO, 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° | Oct 11 | Oct 16 | Oct 19 | Oct 22 | Oct 25 | Oct 28 | Oct 31 | Nov 4 | Nov 9 |
| First 20° | Sep 27 | Oct 2 | Oct 5 | Oct 8 | Oct 11 | Oct 14 | Oct 17 | Oct 20 | Oct 25 |
| First 24° | Sep 23 | Sep 27 | Oct 1 | Oct 3 | Oct 6 | Oct 9 | Oct 11 | Oct 15 | Oct 19 |
| First 28° | Sep 14 | Sep 18 | Sep 21 | Sep 23 | Sep 26 | Sep 28 | Oct 1 | Oct 4 | Oct 8 |
| First 32° | Sep 6 | Sep 10 | Sep 13 | Sep 15 | Sep 18 | Sep 20 | Sep 23 | Sep 26 | Sep 30 |
| First 36° | Aug 19 | Aug 25 | Aug 29 | Sep 2 | Sep 6 | Sep 9 | Sep 13 | Sep 17 | Sep 23 |
📍 Frost Dates for other nearby locations
- Alamosa-bergman Field, CO 19.5 mi
- Great Sand Dunes Nm, CO 22.2 mi
- Manassa, CO 30.1 mi
- Monte Vista, CO 43.5 mi
- Center, CO 43.8 mi
- Cerro, NM 47.0 mi
- Westcliffe, CO 49.9 mi
- Red River, NM 50.4 mi
- Del Norte, CO 54.5 mi
- Walsenburg, CO 56.2 mi
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Data is provided by the NOAA National Centers for Environmental Information.