Mount Crested Butte, CO 81225 Frost Dates
Mount Crested Butte, CO: when does the frost end?
The NOAA station nearest to 81225 does not report a usable frost-date normal for either event, so no last-frost or first-frost figure is shown here. The USDA hardiness zone below is still real: Zone 5a (-20 to -15°F average annual minimum).
Mount Crested Butte against the rest of the dataset
Mount Crested Butte's growing season runs about 47 days, ranking 40,230 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 606 of 624.
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Before leaning on 81225's figures: the methodology explains exactly which NOAA and USDA figures feed 81225's numbers, while zone vs. frost date explains why Zone 5a and Mount Crested Butte's frost date answer different questions.