Last frost date in Herriman, Utah

April 18

Average last frost in spring. In an early year (1 in 10) it's over by March 31; in a late year (1 in 10) it comes after May 6.

October 22

Average first frost in fall. 1 year in 10 it comes by October 7.

Source: NOAA U.S. Climate Normals 1991–2020, station Draper-point Of Mtn (USC00422235), 6.4 miles from Herriman, elevation 4,506 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.

What to plant now

Frost dates for Herriman, Utah
Early yearAverageLate year
Last frost in springMar 31Apr 18May 6
First frost in fallOct 7Oct 22Nov 5

An early or late year is one in 10: 1 year in 10 the frost comes before the early date, and 1 year in 10 after the late date.

Frost-free days in an average year: 185

Planting calendar for Herriman

Fall planting

USDA dates for places whose average first freeze is about October 20 (Herriman: October 22).

USDA lists chervil and chives, garlic, horseradish, leeks, onion plants, onion seed, onion sets, parsnips, garden peas, shallots as generally spring-planted here.

Spring planting

USDA dates for places whose average last freeze is about April 20 (Herriman: April 18).

USDA lists chinese cabbage as generally fall-planted here.

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5 (earliest safe spring and latest safe fall dates), applied to this place's NOAA frost dates. “Plants” means setting out transplants, not sowing seed. How we match the table.

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