Chester, MT 59545 Frost Dates

Chester, MT: when does the frost end?

The NOAA station nearest to 59545 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 4a (-30 to -25°F average annual minimum).

Chester against the rest of the dataset

At roughly 77 frost-free days, Chester places 40,077 of 40,283 ZIP codes in this dataset. Within MT, it ranks 367 of 392.

Learn more

Before leaning on 59545's figures: the methodology explains exactly which NOAA and USDA figures feed 59545's numbers, while zone vs. frost date explains why Zone 4a and Chester's frost date answer different questions.