When to plant Summer squash (zucchini) in Utah

In spring, from Mar 15 – May 1 in Ivins to June 1 – 20 in Heber.

For a fall crop, from May 15 – July 1 in Eagle Mountain to June 1 – July 20 in Woods Cross.

USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.

Summer squash planting dates by place in Utah
PlaceSpringFall
AlpineMay 1 – 30June 1 – July 15
American ForkMay 1 – June 15June 1 – July 20
BluffdaleMay 1 – June 15June 1 – July 20
BountifulMay 1 – June 15June 1 – July 20
Brigham CityMay 1 – 30June 1 – July 1
Cedar CityMay 1 – 30June 1 – July 15
CentervilleMay 1 – June 15June 1 – July 20
ClearfieldMay 1 – 30June 1 – July 20
ClintonMay 1 – June 15June 1 – July 20
Cottonwood HeightsMay 1 – 30June 1 – July 20
DraperMay 1 – June 15June 1 – July 20
Eagle MountainJune 1 – 20May 15 – July 1
FarmingtonMay 1 – June 15June 1 – July 20
GrantsvilleMay 1 – 30June 1 – July 15
HeberJune 1 – 20May 15 – July 1
HerrimanMay 1 – June 15June 1 – July 20
HighlandMay 1 – 30June 1 – July 15
HolladayMay 1 – 30June 1 – July 20
HurricaneApr 10 – June 1June 1 – Aug 10
HyrumMay 10 – June 10June 1 – July 1
IvinsMar 15 – May 1June 1 – Aug 10
KaysvilleMay 1 – June 15June 1 – July 20
Kearns metroApr 20 – June 1June 1 – Aug 1
LaytonMay 1 – 30June 1 – July 20
LehiMay 1 – 30June 1 – July 15
LindonMay 1 – June 15June 1 – July 20
LoganMay 10 – June 10June 1 – July 1
Magna metroApr 10 – June 1June 1 – Aug 1
MapletonMay 1 – June 15June 1 – July 20
MidvaleMay 1 – 30June 1 – July 20
MillcreekMay 1 – June 15June 1 – July 20
MurrayMay 1 – 30June 1 – July 20
North LoganMay 1 – 30June 1 – July 20
North OgdenMay 1 – June 15June 1 – July 20
North Salt LakeMay 1 – June 15June 1 – July 20
OgdenMay 1 – June 15June 1 – July 20
OremMay 1 – June 15June 1 – July 20
PaysonMay 1 – 30June 1 – July 15
Pleasant GroveMay 1 – June 15June 1 – July 20
Pleasant ViewMay 1 – June 15June 1 – July 20
ProvoMay 1 – June 15June 1 – July 20
RivertonMay 1 – June 15June 1 – July 20
RoyMay 1 – June 15June 1 – July 20
SalemMay 1 – June 15June 1 – July 20
Salt Lake CityApr 10 – June 1June 1 – Aug 10
SandyMay 1 – 30June 1 – July 20
SantaquinMay 1 – 30June 1 – July 15
Saratoga SpringsMay 1 – 30June 1 – July 15
SmithfieldMay 10 – June 10June 1 – July 1
South JordanMay 1 – June 15June 1 – July 20
South OgdenMay 1 – June 15June 1 – July 20
South Salt LakeApr 10 – June 1June 1 – Aug 10
Spanish ForkMay 1 – June 15June 1 – July 20
SpringvilleMay 1 – June 15June 1 – July 20
St. GeorgeMar 15 – May 1June 1 – Aug 10
SyracuseMay 1 – June 15June 1 – July 20
TaylorsvilleApr 10 – June 1June 1 – Aug 10
TooeleMay 1 – 30June 1 – July 20
TremontonMay 1 – June 15June 1 – July 20
VernalMay 10 – June 10June 1 – July 15
VineyardMay 1 – June 15June 1 – July 20
WashingtonMar 15 – May 1June 1 – Aug 10
West HavenMay 1 – June 15June 1 – July 20
West JordanMay 1 – June 15June 1 – July 20
West PointMay 1 – June 15June 1 – July 20
West Valley CityApr 20 – June 1June 1 – Aug 1
Woods CrossMay 1 – June 15June 1 – July 20

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. The full USDA table for summer squash.