Leadville, CO 81251 Frost Dates
81251, near Leadville, CO: the frost window
The NOAA station nearest to 81251 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).
Leadville against the rest of the dataset
Leadville's growing season runs about 52 days, ranking 40,211 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 604 of 624.
Learn more
Two guides worth reading on 81251: the methodology, on exactly which NOAA and USDA figures feed 81251's numbers, and zone vs. frost date, on why Zone 5a and Leadville's frost date answer different questions.