Granby, CO 80446 Frost Dates
Granby, CO: when does the frost end?
The NOAA station nearest to 80446 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).
Granby against the rest of the dataset
Granby's growing season runs about 54 days, ranking 40,206 of 40,283 US ZIP codes measured here, longest to shortest. Within CO, it ranks 599 of 624.
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Before leaning on 80446's figures: local microclimates explains what one yard in Granby can differ from the 80446 normal, while the methodology explains exactly which NOAA and USDA figures feed 80446's numbers.