Frost Dates: First and last frost dates for Manassa, 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 11, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around June 24, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before June 13, 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 7 | May 1 | Apr 26 | Apr 23 | Apr 19 | Apr 15 | Apr 12 | Apr 7 | Apr 1 |
| Last 20° | May 17 | May 12 | May 9 | May 6 | May 3 | Apr 30 | Apr 27 | Apr 24 | Apr 19 |
| Last 24° | May 26 | May 21 | May 17 | May 14 | May 11 | May 8 | May 5 | May 2 | Apr 27 |
| Last 28° | Jun 16 | Jun 9 | Jun 4 | May 31 | May 27 | May 23 | May 19 | May 14 | May 7 |
| Last 32° | Jun 25 | Jun 20 | Jun 16 | Jun 12 | Jun 9 | Jun 6 | Jun 3 | May 30 | May 24 |
| Last 36° | Jul 11 | Jul 5 | Jul 1 | Jun 27 | Jun 24 | Jun 21 | Jun 18 | Jun 13 | Jun 8 |
ℹ️ How to read these charts for the fall
As summer ends in Manassa, 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 2 | Oct 7 | Oct 10 | Oct 13 | Oct 16 | Oct 19 | Oct 22 | Oct 25 | Oct 30 |
| First 20° | Sep 27 | Oct 1 | Oct 4 | Oct 7 | Oct 9 | Oct 12 | Oct 14 | Oct 17 | Oct 21 |
| First 24° | Sep 18 | Sep 22 | Sep 25 | Sep 28 | Sep 30 | Oct 2 | Oct 5 | Oct 8 | Oct 12 |
| First 28° | Sep 9 | Sep 13 | Sep 16 | Sep 19 | Sep 21 | Sep 24 | Sep 26 | Sep 29 | Oct 4 |
| First 32° | Aug 24 | Aug 30 | Sep 4 | Sep 8 | Sep 11 | Sep 15 | Sep 19 | Sep 23 | Sep 30 |
| First 36° | Aug 8 | Aug 15 | Aug 20 | Aug 24 | Aug 27 | Aug 31 | Sep 4 | Sep 9 | Sep 15 |
📍 Frost Dates for other nearby locations
- Alamosa-bergman Field, CO 20.5 mi
- Blanca, CO 32.5 mi
- Tres Piedras, NM 34.5 mi
- Cerro, NM 35.1 mi
- Monte Vista, CO 36.1 mi
- Center, CO 42.3 mi
- Red River, NM 45.1 mi
- Del Norte, CO 46.9 mi
- Great Sand Dunes Nm, CO 48.8 mi
- Chama, NM 49.4 mi
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Data is provided by the NOAA National Centers for Environmental Information.