Fort Collins Recorded Record Late-Season Heat

The city reached 90 degrees in October for the first time in local history.

Updated on Oct. 7, 2026 in Current Conditions

Dry, golden prairie grass under intense, shimmering heat on the high plains. — Fort Collins experienced unprecedented heat this week as temperatures reached 90 degrees, setting a new record for the latest such day in the city's history. AI Illustration. Upload story photo >

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Fort Collins experienced unprecedented October heat as temperatures hit 90 degrees on October 5 and 6, 2026. This occurrence established a new record for the latest 90-degree day in the city since temperature tracking began in the 1800s.

Why it matters

These unseasonably high temperatures shattered previous October records, which had historically peaked at 88 degrees. The event highlights a notable deviation from historical climate norms for the region.

Official recordings from the Colorado State University weather station confirmed 90-degree highs on October 5 and 6, exceeding the previous October maximum of 88 degrees. These figures represent a 15-degree jump above the normal daily high.

The players

Colorado State University

This public research university hosts the official weather station responsible for monitoring and recording temperature data in Fort Collins.

The details

The heat was measured by the official weather station at Colorado State University, breaking the city's previous record for the latest 90-degree day, which occurred on September 28, 2011. While temperatures are expected to persist in the mid-80s through the week, a cooldown accompanied by showers is projected to start next week.

Temperature records for Fort Collins began in the 1800s.
The previous October record of 88 degrees was set on October 17, 1926.
The prior latest 90-degree day was recorded on September 28, 2011.
Temperatures reached 90 degrees on October 5, 2026.
Temperatures reached 90 degrees on October 6, 2026.

Seasonal Patterns

This record-breaking event marks a departure from the historical baseline established by the 1926 October record of 88 degrees. The occurrence underscores a shift in localized temperature extremes relative to records dating back to the 1800s.

Residents should continue to monitor local forecasts as temperatures remain above average through the week. Officials advise staying hydrated and preparing for a shift to cooler, wetter conditions expected to arrive next week.

The takeaway

While the extreme heat provided an unusual early October experience, the expected return to seasonal averages next week highlights the volatility of regional weather. Residents should adjust their outdoor activities to accommodate the lingering mid-80s heat until the projected cooldown arrives.