Central Utah: Juab, Millard, Sanpete, Sevier, Piute and Wayne

Zones 5b to 7a; most cities fall in 5b and 6a.

Central Utah's high valleys fall mostly in zones 5b to 6b on the 2023 USDA data. USU's averages: Delta, last frost May 17, 134 frost-free days; Fillmore, May 16, 140 days; Moroni, June 1, 109 days.^[1] Its planting table adds Nephi (May 16), Manti (May 24), Richfield (May 28) and Loa (June 15).^[2]

Frost dates

From USU Extension; averages vary from year to year
Town	Average last spring frost	Average first fall frost	Frost-free days
Delta	May 17	Sept. 28	134
Fillmore	May 16	Oct. 4	140
Moroni	June 1	Sept. 18	109

When to plant vegetables

Hardy crops (A) go in first, then semi-hardy (B), tender (C) and very tender (D). (P) means protect with a cover.

From USU Extension, Suggested Vegetable Planting Dates for Utah
Location	Average last frost	Group A	Group B	Group C	Group D
Loa	June 15	May 10	May 20	June 1	June 1 (P)
Manti	May 24	May 1	May 10	May 25	June 1 (P)
Marysvale	June 3	May 1	May 10	May 20	May 25 (P)
Nephi	May 16	March 15	April 1	May 16	June 1
Richfield	May 28	April 1	April 15	May 25	June 1 (P)

See every crop group and all 36 locations

Which lawn calendar to use

Juab County falls in the northern Utah turf calendar.^[3] Millard and Piute are in the southwest calendar,^[4] Wayne is in the southeast calendar,^[5] and USU splits Sanpete and Sevier counties between the southwest and southeast calendars, so check which one lists your town.

See the month-by-month lawn calendar

Good to know here

USU says to plant very tender vegetables under cover (P) in Manti, Richfield, Loa and Marysvale, where late frosts are common.^[2]

Zone by city

Zones come from the 2023 USDA map data matched to each city's nearest ZIP codes. A range means the ZIP codes around the city disagree; your own yard may differ, so check your address on the USDA map. Tap a city for its page.

Richfield6a
Nephi5b–6b
Ephraim5b–6a
Manti6a–6b
Fillmore6a
Salina6a
Mount Pleasant5b–6a
Gunnison6a
Monroe6a
Mona6a–6b
Annabella6a
Aurora6a
Bicknell6a
Centerfield6a
Central Valley6a
Circleville5b–6a
Delta6a–6b
Elsinore6a
Eureka6b
Fairview5b
Fayette6a–6b
Fountain Green5b
Glenwood6a
Hanksville7a
Hinckley6a–6b
Holden5b–6a
Joseph6a
Junction5b–6a
Kanosh6a–6b
Kingston5b–6a
Koosharem5b–6a
Leamington6a–6b
Levan5b–6a
Loa6a
Lyman6a
Lynndyl6a–6b
Marysvale6a
Mayfield6a
Meadow6a–6b
Moroni5b
Oak City6a–6b
Redmond6a
Rocky Ridge6b
Scipio5b–6a
Sigurd6a
Spring City5b–6a
Sterling6a
Torrey6a
Wales5b

Other regions

Sources

Sources opened and checked October 26, 2026. Dates and zones are averages; conditions, rebate amounts and drought rules change, so confirm with your water provider and USU Extension before you spend money.