Frost dates for 80801Anton, CO
The average last spring frost in Anton is May 12 and the average first fall frost is October 4, giving a typical growing season of about 143 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 12
- Average first fall frost
- Oct 4
- Growing season
- 143 days
Safer after May 26 (1-in-10 risk)
Possible by Sep 21 (1-in-10 risk)
Last frost typically in 197 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 10 · May 22 · Jun 5 | Sep 11 · Sep 25 · Oct 6 | 126 days | 100% |
| Frost / freeze (32°F) | Apr 30 · May 12 · May 26 | Sep 21 · Oct 4 · Oct 16 | 143 days | 100% |
| Hard freeze (28°F) | Apr 17 · May 1 · May 14 | Oct 1 · Oct 13 · Oct 24 | 163 days | 100% |
Planting calendar for Anton
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 11 – Jun 17 |
| Tomatoes | Transplant outdoors | May 28 – Jun 14 |
| Peppers | Start seeds indoors | Apr 11 – May 12 |
| Peppers | Transplant outdoors | Jun 11 – Jul 12 |
| Eggplant | Start seeds indoors | Apr 28 – May 27 |
| Eggplant | Transplant outdoors | Jun 11 – Jul 12 |
| Cucumbers | Sow outdoors | Jun 11 – Jun 24 |
| Summer squash | Sow outdoors | May 28 – Jul 12 |
| Winter squash & pumpkins | Sow outdoors | Jun 11 – Jul 12 |
| Snap beans | Sow outdoors | May 28 – Jul 17 |
| Sweet corn | Sow outdoors | May 28 – Jun 14 |
| Watermelon & cantaloupe | Sow outdoors | Jun 11 – Jul 12 |
| Okra | Sow outdoors | Jun 4 – Jun 27 |
| Peas | Sow outdoors (spring) | Apr 11 – May 27 |
| Potatoes | Plant outdoors (spring) | Apr 11 – Jun 11 |
| Onions | Start seeds indoors (spring) | Feb 28 – Mar 27 |
| Onions | Transplant outdoors (spring) | Apr 28 – May 27 |
| Broccoli | Start seeds indoors (spring) | Mar 24 – Apr 27 |
| Broccoli | Transplant outdoors (spring) | Apr 28 – May 27 |
| Broccoli | Start seeds indoors (fall) | Jun 4 – Jun 14 |
| Broccoli | Transplant outdoors (fall) | Jul 4 – Jul 15 |
| Cabbage | Start seeds indoors (spring) | Mar 14 – Apr 11 |
| Cabbage | Transplant outdoors (spring) | Apr 11 – May 12 |
| Cabbage | Start seeds indoors (fall) | May 25 – Jun 24 |
| Cabbage | Transplant outdoors (fall) | Jun 24 – Jul 25 |
| Leaf lettuce | Sow outdoors (spring) | Apr 11 – Jun 27 |
| Leaf lettuce | Sow outdoors (fall) | Jun 24 – Aug 10 |
| Spinach | Sow outdoors (spring) | Apr 4 – May 18 |
| Spinach | Sow outdoors (fall) | Jul 11 – Aug 15 |
| Radishes | Sow outdoors (spring) | Apr 11 – Jun 1 |
| Radishes | Sow outdoors (fall) | Jun 24 – Aug 25 |
| Kale | Sow outdoors (spring) | Apr 28 – May 18 |
| Kale | Sow outdoors (fall) | Jun 17 – Jul 25 |
| Carrots | Sow outdoors (spring) | May 12 – Jun 27 |
| Carrots | Sow outdoors (fall) | May 25 – Jul 10 |
| Garlic | Plant outdoors (fall) | Sep 24 – Oct 25 |
Where these dates come from
ZIP code 80801 is matched to the NOAA station Shaw 4Ene, CO, 18.7 km away, at 5,000 ft elevation (207 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Shaw 4Ene, CO (used) | 5,000 ft | May 12 | Oct 4 |
| Lindon 5 Wnw, CO | 4,851 ft | May 15 | Oct 2 |
| Joes, CO | 4,275 ft | May 3 | Oct 9 |
| Flagler 1S, CO | 4,921 ft | May 5 | Oct 8 |
Frost dates near Anton
- Cope, CO 80812 · last May 3, first Oct 9
- Lindon, CO 80740 · last May 15, first Oct 2
- Joes, CO 80822 · last May 3, first Oct 9
- Woodrow, CO 80757 · last May 15, first Oct 2
- Flagler, CO 80815 · last May 5, first Oct 8
- Arriba, CO 80804 · last May 5, first Oct 8
- Seibert, CO 80834 · last May 4, first Oct 11
- Genoa, CO 80818 · last May 8, first Oct 10
Frequently asked questions
- When is the last frost in Anton, CO?
- For ZIP code 80801, the average last spring frost (32°F) is May 12, based on NOAA 1991-2020 climate normals for the Shaw 4Ene, CO weather station. There is a 1-in-10 chance of a frost after May 26.
- When is the first frost in Anton, CO?
- The average first fall frost (32°F) is October 4. There is a 1-in-10 chance of frost by September 21, so tender plants are at risk from that point on.
- How long is the growing season in 80801?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 143 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.