Frost dates / Colorado / Centennial
Frost dates in Centennial, CO
The station on this page is DENVER CENTENNIAL AP, CO US (USW00093067), 1.6 miles from the city point. Population in the Census 2024 estimate is 108,853.
Zone 6aUSDA average annual extreme minimum -10°F to -5°F, from ZIP 80112 (1.2 miles from the city point used on this page).
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Last 32°F in spring
NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.
| Probability | Date | How to read it |
|---|---|---|
| 90% | April 24 | Earlier date. A last 32°F on or after this day is common. |
| 50% | May 5 | Median. |
| 10% | May 17 | Later date. A last 32°F on or after this day is uncommon. |
First 32°F in fall
NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.
| Probability | Date | How to read it |
|---|---|---|
| 10% | September 25 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | October 8 | Median. |
| 90% | October 20 | Later date. A first 32°F on or before this day is common. |
32°F growing-season length
Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.
| Probability the season is at least this long | Days |
|---|---|
| 10% | 170 |
| 50% | 154 |
| 90% | 135 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 9 | April 25 | April 10 |
| First, on or before | October 4 | October 17 | October 28 |
| Season at least | 192 days | 172 days | 153 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 30 | May 15 | May 3 |
| First, on or before | September 17 | October 1 | October 12 |
| Season at least | 153 days | 136 days | 117 days |
Station DENVER CENTENNIAL AP, CO US (USW00093067). Completeness flag R, 20 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 1793.1 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.
Check a crop against this station
Centennial, CO
Zone 6aAverage annual extreme minimum -10°F to -5°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Colorado. Nearest qualified station: DENVER CENTENNIAL AP, CO US (USW00093067), 1.6 miles. Median last 32°F May 5. Median first 32°F October 8. The 50% growing-season length is 154 days.
32°F probabilities at this station
| 10% | 50% | 90% | |
|---|---|---|---|
| Last 32°F on or after | May 17 | May 5 | April 24 |
| First 32°F on or before | September 25 | October 8 | October 20 |
Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.
Planting calendar
Frost dates for Colorado are above. Planting windows appear for states with a cited extension guide. The fall and seed tools use the numbers you enter and the station dates.
Date checks use your device’s calendar and appear after the page loads.