Weather on March 21
Fort Collins, CO
55 Years of Data
Avg High
58°F
Avg Low
29°F
Warmest
2026
67°F avg
Coldest
2006
22°F avg
About This Date
March 21st in Fort Collins, CO typically brings cool spring weather, with average highs around 58°F and lows near 29°F — a 29°F daily swing. Over 56 years of records, the warmest March 21st was in 2026 (67°F average), while the coldest was 2006 (22°F) — a 45°F range across recorded history. Precipitation has occurred on 16% of recorded March 21st dates, with snow falling 9% of the time (heaviest snowfall: 2.5"). The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
Planning for March 21st in Fort Collins, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
1.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 91° | 42° | 67° | — | — |
| 2025 | 57° | 31° | 44° | — | — |
| 2024 | 69° | 30° | 50° | — | — |
| 2023 | 59° | 35° | 47° | — | — |
| 2022 | 59° | 36° | 47° | — | — |
| 2021 | 49° | 33° | 41° | 0.2" | — |
| 2020 | 49° | 13° | 31° | — | — |
| 2019 | 60° | 26° | 43° | — | — |
| 2018 | 62° | 29° | 45° | — | — |
| 2017 | 63° | 39° | 51° | — | — |
| 2016 | 74° | 31° | 52° | — | — |
| 2015 | 72° | 30° | 51° | — | — |
| 2014 | 55° | 29° | 42° | — | — |
| 2013 | 55° | 30° | 43° | — | — |
| 2012 | 67° | 26° | 46° | — | — |
| 2011 | 68° | 35° | 52° | — | — |
| 2010 | 60° | 17° | 39° | — | — |
| 2009 | 74° | 32° | 53° | — | — |
| 2008 | 57° | 27° | 42° | — | — |
| 2007 | 70° | 44° | 57° | — | — |
| 2006coldest | 30° | 14° | 22° | 0.1" | 0.7" |
| 2005 | 54° | 37° | 45° | 0.94" | — |
| 2004 | 60° | 29° | 44° | — | — |
| 2003 | 52° | 33° | 42° | 0.18" | — |
| 2002 | 53° | 11° | 32° | — | — |
| 2001 | 63° | 40° | 51° | — | — |
| 2000 | 36° | 26° | 31° | 0.33" | 2" |
| 1999 | 69° | 33° | 51° | — | — |
| 1998 | 55° | 22° | 38° | — | — |
| 1997 | 65° | 48° | 56° | — | — |
| 1996 | 56° | 31° | 43° | — | — |
| 1995 | 75° | 36° | 55° | — | — |
| 1994 | 69° | 25° | 47° | — | — |
| 1993 | 57° | 34° | 45° | — | — |
| 1992 | 51° | 31° | 41° | 0.23" | 1" |
| 1991 | 59° | 28° | 44° | — | — |
| 1990 | 66° | 39° | 53° | — | — |
| 1989 | 57° | 17° | 37° | — | — |
| 1988 | 70° | 35° | 52° | — | — |
| 1987 | 46° | 23° | 35° | — | — |
| 1986 | 67° | 25° | 46° | — | — |
| 1985 | 62° | 28° | 45° | — | — |
| 1984 | 59° | 27° | 43° | — | — |
| 1983 | 37° | 10° | 24° | — | — |
| 1982 | 42° | 17° | 30° | — | — |
| 1981 | 40° | 32° | 36° | 0.46" | 2.5" |
| 1980 | 57° | 26° | 42° | — | — |
| 1979 | 40° | 31° | 35° | 0.28" | 1" |
| 1978 | 72° | 30° | 51° | — | — |
| 1977 | 53° | 15° | 34° | — | — |
| 1976 | 45° | 32° | 38° | — | — |
| 1975 | 58° | 34° | 46° | 0.56" | — |
| 1974 | 46° | 15° | 31° | — | — |
| 1973 | 53° | 33° | 43° | — | — |
| 1972 | 63° | 28° | 45° | — | — |
| 1971 | 58° | 28° | 43° | — | — |
56 years of data from FT COLLINS