Frost dates for 80132Monument, CO
The average last spring frost in Monument is May 14 and the average first fall frost is October 1, giving a typical growing season of about 138 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 14
- Average first fall frost
- Oct 1
- Growing season
- 138 days
Safer after May 31 (1-in-10 risk)
Possible by Sep 16 (1-in-10 risk)
Last frost typically in 199 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 14 · May 27 · Jun 12 | Sep 9 · Sep 21 · Oct 4 | 116 days | 100% |
| Frost / freeze (32°F) | May 2 · May 14 · May 31 | Sep 16 · Oct 1 · Oct 14 | 138 days | 100% |
| Hard freeze (28°F) | Apr 21 · May 3 · May 16 | Sep 23 · Oct 10 · Oct 25 | 158 days | 100% |
Planting calendar for Monument
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 13 – Jun 19 |
| Tomatoes | Transplant outdoors | May 30 – Jun 11 |
| Peppers | Start seeds indoors | Apr 13 – May 14 |
| Peppers | Transplant outdoors | Jun 13 – Jul 14 |
| Eggplant | Start seeds indoors | Apr 30 – May 29 |
| Eggplant | Transplant outdoors | Jun 13 – Jul 14 |
| Cucumbers | Sow outdoors | Jun 13 – Jun 21 |
| Summer squash | Sow outdoors | May 30 – Jul 14 |
| Winter squash & pumpkins | Sow outdoors | Jun 13 – Jul 14 |
| Snap beans | Sow outdoors | May 30 – Jul 14 |
| Sweet corn | Sow outdoors | May 30 – Jun 11 |
| Watermelon & cantaloupe | Sow outdoors | Jun 13 – Jul 14 |
| Okra | Sow outdoors | Jun 6 – Jun 29 |
| Peas | Sow outdoors (spring) | Apr 13 – May 29 |
| Potatoes | Plant outdoors (spring) | Apr 13 – Jun 13 |
| Onions | Start seeds indoors (spring) | Mar 2 – Mar 29 |
| Onions | Transplant outdoors (spring) | Apr 30 – May 29 |
| Broccoli | Start seeds indoors (spring) | Mar 26 – Apr 29 |
| Broccoli | Transplant outdoors (spring) | Apr 30 – May 29 |
| Broccoli | Start seeds indoors (fall) | Jun 1 – Jun 11 |
| Broccoli | Transplant outdoors (fall) | Jul 1 – Jul 12 |
| Cabbage | Start seeds indoors (spring) | Mar 16 – Apr 13 |
| Cabbage | Transplant outdoors (spring) | Apr 13 – May 14 |
| Cabbage | Start seeds indoors (fall) | May 22 – Jun 21 |
| Cabbage | Transplant outdoors (fall) | Jun 21 – Jul 22 |
| Leaf lettuce | Sow outdoors (spring) | Apr 13 – Jun 29 |
| Leaf lettuce | Sow outdoors (fall) | Jun 21 – Aug 7 |
| Spinach | Sow outdoors (spring) | Apr 6 – May 20 |
| Spinach | Sow outdoors (fall) | Jul 8 – Aug 12 |
| Radishes | Sow outdoors (spring) | Apr 13 – Jun 3 |
| Radishes | Sow outdoors (fall) | Jun 21 – Aug 22 |
| Kale | Sow outdoors (spring) | Apr 30 – May 20 |
| Kale | Sow outdoors (fall) | Jun 14 – Jul 22 |
| Carrots | Sow outdoors (spring) | May 14 – Jun 29 |
| Carrots | Sow outdoors (fall) | May 22 – Jul 7 |
| Garlic | Plant outdoors (fall) | Sep 21 – Oct 22 |
Where these dates come from
ZIP code 80132 is matched to the NOAA station Monument, CO, 1.2 km away, at 7,080 ft elevation (30 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Monument, CO (used) | 7,080 ft | May 14 | Oct 1 |
| Monument 3S, CO | 6,821 ft | May 17 | Oct 1 |
| Black Forest 6Wnw, CO | 6,957 ft | May 11 | Oct 6 |
| Cumbre Vista - Colorado Spgs 1, CO | 6,942 ft | May 9 | Oct 6 |
Frost dates near Monument
- Palmer Lake, CO 80133 · last May 14, first Oct 1
- Colorado Springs, CO 80921 · last May 14, first Oct 1
- Larkspur, CO 80118 · last May 17, first Oct 1
- Woodland Park, CO 80866 · last —, first —
- Green Mountain Falls, CO 80819 · last —, first —
- Elbert, CO 80106 · last May 29, first Sep 21
- Cascade, CO 80809 · last May 14, first Oct 1
- Manitou Springs, CO 80829 · last May 3, first Oct 8
Frequently asked questions
- When is the last frost in Monument, CO?
- For ZIP code 80132, the average last spring frost (32°F) is May 14, based on NOAA 1991-2020 climate normals for the Monument, CO weather station. There is a 1-in-10 chance of a frost after May 31.
- When is the first frost in Monument, CO?
- The average first fall frost (32°F) is October 1. There is a 1-in-10 chance of frost by September 16, so tender plants are at risk from that point on.
- How long is the growing season in 80132?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 138 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.