Fort Collins, Colorado Weather
Granite bones emerge from cover. Day 50 of autumn. Read this microseason across nine climate regions →
Fort Collins weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 2:29 PM MST · Open-Meteo
- TodayNov 10Clear later——72°32°—
- WednesdayNov 11Clear——64°37°-8°
- ThursdayNov 12Partly Cloudy——65°37°+1°
- FridayNov 13Overcast——63°51°-2°
- SaturdayNov 14Overcast12%—51°43°-12°
- SundayNov 15Heavy Drizzle15%0.22″47°38°-4°
- MondayNov 16Overcast——50°40°+3°
Air quality now AQI 51 · Moderate
AQI 51 (Moderate), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 47 now. With UV 1.4 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 8.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 47 now. With UV 1.4 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 8.
- Present
- AQI 47
- UV peak
- 1.4 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 8
PM × Wind × Precip
PM2.5 at 5.9 µg/m³ (AQI 33), ratio 0.67 with 10 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.67
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- transport
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
When the wind is in the west, the weather is at its best.
- Moonrise
- 8:25 AM
- Moonset
- —
- In sign
- ♐︎ Sagittarius
Granite bones emerge from cover
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Fort Collins at a glance
- Today vs. normal: Today averages 52°F (high 72°F, low 32°F), 11°F above the 41°F normal for Nov 10
- Last frost: May 2 (1991–2020 median, NOAA station 4 km away)
- Microseason: Nov 6–10
16-Day Forecast — Fort Collins
- Tue71°32°0%
- Wed64°37°2%
- Thu65°37°1%
- Fri63°51°0%
- Sat51°43°12%
- Sun47°38°15%
- Mon50°40°1%
- Tue53°43°20%
- Wed53°43°29%
- Thu44°34°22%
- Fri34°29°50%
- Sat41°27°38%
- Sun42°19°6%
- Mon37°17°6%
- Tue53°35°13%
- Wed53°42°16%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Fort Collins
Interactive wind and temperature map centered on Fort Collins — it loads in your browser. Open the full weather map.
Right now in the garden
Post-frost dormancy
As of November 10, the season's first frost (typically October 7) is due or past. Bring frost-tender plants indoors, mulch overwintering beds, and turn spent plantings under. This city's planting calendar lists nothing to plant or harvest in November.
Sun & seasons in Fort Collins
Fort Collins sits in Larimer County, where the year’s longest day runs 15h 5m of daylight and its shortest just 9h 16m — a swing of +5h 48m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Denver, the state’s largest city, lies about 55 miles to the S. The nearest town Fort Collins tracks is Timnath, roughly 6 miles to the E.
Air quality in Fort Collins
Air quality in Fort Collins’s county has held roughly steady since 2020; its cleanest year on record was 2020 (median AQI 49). See the full air-quality history for Fort Collins.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | beans, squash, fall brassicas, carrots | lettuce, peas, spinach, beans, summer squash, garlic |
| August | — | tomatoes, peppers, beans, summer squash, garlic |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| October | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
A year in weather
Fort Collins's warmest month is July (~73°F mean) and its coldest is December (~31°F). Rainfall peaks in May (2.7 inches) and bottoms out in January (0.4 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 32° | 0.4″ | 2 |
| February | 34° | 0.5″ | 2 |
| March | 42° | 1.3″ | 3 |
| April | 49° | 2.1″ | 5 |
| May | 58° | 2.7″ | 6 |
| June | 67° | 1.9″ | 4 |
| July | 73° | 1.6″ | 4 |
| August | 71° | 1.4″ | 3 |
| September | 63° | 1.4″ | 3 |
| October | 50° | 1.3″ | 3 |
| November | 39° | 0.7″ | 2 |
| December | 31° | 0.5″ | 2 |
Regional context
Similar climates Timnath, CO, Laporte, CO, Loveland, CO
Fort Collins's climate, from NOAA NCEI 1991-2020 station normals, pairs 32°F Januarys with 73°F Julys — a 41°F swing. About 15.9 inches of precipitation falls over roughly 37 days a year.
Precipitation in Fort Collins runs summer-dominant: May averages 2.7 inches across 5.8 days of warm-season storms, while January drops to 0.4 inches over 1.6 rainy days of drier cool air. That puts Fort Collins in a summer-convective cohort with places like Timnath, CO, Laporte, CO and Loveland, CO.
The cool-season window in Fort Collins starts at May 2, when nights stop freezing — think peas, lettuce, spinach, and radishes. In Fort Collins, warm-season transplants — tomatoes, peppers, basil — wait two weeks past Fort Collins's frost date. Fort Collins's window closes around October 7 as Fort Collins's overnight lows return below freezing. Sheltered Fort Collins yards can escape a light frost.
Similar climates: Timnath, CO, Laporte, CO, Loveland, CO, Windsor, CO, Severance, CO.
Frequently asked
- When does it freeze in Fort Collins?
- Fort Collins's last spring frost lands near May 2, and in Fort Collins the first fall frost follows around October 7.
- What is the rainy season in Fort Collins?
- May is the wettest month in Fort Collins, about 2.7 inches on average; the year totals roughly 16 inches.
- What is the warmest month in Fort Collins?
- On average July tops the year in Fort Collins at about 73°F.
- What is the coldest month in Fort Collins?
- The coldest stretch in Fort Collins falls in December, around 31°F on average.
- When can I start a vegetable garden in Fort Collins?
- In Fort Collins, sow peas and hardy greens around May 2; Fort Collins's tomatoes and peppers wait two weeks more.
- How many rainy days does Fort Collins get?
- Fort Collins records around 37 days of measurable precipitation annually.
- What hardiness zone is Fort Collins?
- Since December in Fort Collins averages 31°F, Fort Collins's USDA zone follows that floor — confirm it by ZIP.
- What is the 10-day forecast for Fort Collins?
- Fort Collins's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Fort Collins?
- See this week's day-by-day rain chances for Fort Collins in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Fort Collins?
- Current conditions for Fort Collins and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Fort Collins forecast updated?
- The Fort Collins forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Fort Collins?
- Today's sunrise and sunset times for Fort Collins are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Fort Collins?
- The next few days in Fort Collins's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Fort Collins sits at 40.5°N; its climate zone is cold semi-arid (Köppen approximation).
ZIP codes in Fort Collins
- 80521
- 80523
- 80524
- 80525
- 80526
- 80527
- 80528
- 80553