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First and last freeze/frost dates for Fort Collins, CO ,United States

First and last freeze/frost dates for:
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Each winter, on average, your risk of frost is from October 2 through May 4.

Almost certainly, however, you will receive frost from October 17 through April 23.

You are almost guaranteed that you will not get frost from May 15 through September 18.

Your frost-free growing season is around 151 days.

Detailed station data* follows:

Ft Collins, CO (Larimer county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 15 May 11 May 8 May 6 May 4 May 2 Apr 30 Apr 27 Apr 23
Spring 28° May 2 Apr 27 Apr 24 Apr 21 Apr 18 Apr 16 Apr 13 Apr 10 Apr 5
Spring 24° Apr 20 Apr 15 Apr 12 Apr 9 Apr 7 Apr 4 Apr 1 Mar 29 Mar 25
Fall 32° Sep 18 Sep 23 Sep 26 Sep 29 Oct 2 Oct 5 Oct 8 Oct 12 Oct 17
Fall 28° Sep 24 Sep 30 Oct 4 Oct 7 Oct 10 Oct 13 Oct 17 Oct 21 Oct 26
Fall 24° Oct 4 Oct 10 Oct 14 Oct 18 Oct 21 Oct 25 Oct 28 Oct 31 Nov 6

Waterdale, CO (Larimer county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 18 May 14 May 12 May 9 May 8 May 6 May 3 May 1 Apr 27
Spring 28° May 10 May 6 May 3 May 1 Apr 29 Apr 26 Apr 24 Apr 21 Apr 17
Spring 24° Apr 29 Apr 25 Apr 21 Apr 19 Apr 16 Apr 13 Apr 10 Apr 7 Apr 3
Fall 32° Sep 16 Sep 20 Sep 22 Sep 25 Sep 27 Sep 29 Oct 2 Oct 5 Oct 9
Fall 28° Sep 22 Sep 27 Oct 1 Oct 5 Oct 8 Oct 11 Oct 14 Oct 18 Oct 24
Fall 24° Oct 1 Oct 7 Oct 11 Oct 15 Oct 18 Oct 22 Oct 25 Oct 30 Nov 3

Longmont 2 Ese, CO (Boulder county):

Temperature10%20%30%40%50%60%70%80%90%
Spring 32° May 18 May 13 May 10 May 7 May 5 May 2 Apr 29 Apr 26 Apr 22
Spring 28° May 8 May 3 Apr 30 Apr 27 Apr 24 Apr 22 Apr 19 Apr 15 Apr 10
Spring 24° May 1 Apr 26 Apr 23 Apr 20 Apr 17 Apr 14 Apr 11 Apr 7 Apr 2
Fall 32° Sep 15 Sep 19 Sep 23 Sep 25 Sep 28 Sep 30 Oct 3 Oct 6 Oct 10
Fall 28° Sep 22 Sep 28 Oct 2 Oct 5 Oct 8 Oct 11 Oct 15 Oct 19 Oct 24
Fall 24° Sep 28 Oct 4 Oct 8 Oct 12 Oct 16 Oct 19 Oct 23 Oct 27 Nov 1

* This station data is available courtesy the National Climatic Data Center.

For each weather station, you will see a temperature along with tables of data organized into percentage columns. The percentage column tells you the probability that you will experience that row's temperature on or near that date. Here are two examples to help you determine your probable last frost and first freeze dates.

Example 1 (Last Frost). In the Spring 32° row, if you have "Apr 15" under the 50% column, that means you have a 50% chance of seeing frost on or before April 15th.

Example 2 (First Freeze). In the Fall 24° row, if you have "Dec 1" under the 90% column, that means you have a 90% chance of seeing 24 degrees on or after December 1st.

Empty cells indicate you have a less than 10% chance of ever seeing that temperature.


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