When to plant onions in Utah

Onions
Plant out in Salt Lake City
Feb 17–Mar 10

Across Utah the window opens between January 31 and April 21. Find your city below; the dates follow each town's own average last frost.

Start indoors, Salt Lake City
Jan 6–Feb 3
Plant out, Salt Lake City
Feb 17–Mar 10
Last frost, Salt Lake City
Mar 31

Start seeds indoors 8–12 weeks before the last frost; plant out 3–6 weeks before the last frost. Northern gardens need long-day varieties and southern gardens need short-day ones. A wrong pick gives small bulbs.

Onions planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
Salt Lake CityFeb 17–Mar 10
West Valley CityFeb 25–Mar 18
West JordanMar 7–Mar 28
ProvoMar 7–Mar 28
St. GeorgeJan 31–Feb 21
LehiMar 19–Apr 9
OremMar 8–Mar 29
SandyMar 18–Apr 8
OgdenMar 10–Mar 31
South JordanMar 7–Mar 28
LaytonMar 18–Apr 8
Eagle MountainApr 21–May 12
MillcreekMar 14–Apr 4
HerrimanMar 7–Mar 28
Saratoga SpringsMar 19–Apr 9
TaylorsvilleFeb 17–Mar 10
LoganMar 27–Apr 17
MurrayMar 18–Apr 8
DraperMar 7–Mar 28
Spanish ForkMar 14–Apr 4
RivertonMar 7–Mar 28
BountifulMar 14–Apr 4
TooeleMar 21–Apr 11
Cedar CityMar 23–Apr 13
American ForkMar 6–Mar 27
SyracuseMar 11–Apr 1
RoyMar 11–Apr 1
Pleasant GroveMar 6–Mar 27
WashingtonJan 31–Feb 21
MidvaleMar 18–Apr 8
All 47 cities
CityStart indoorsPlant outLast frost
Salt Lake CityJan 6 to Feb 3Feb 17 to Mar 10Mar 31
West Valley CityJan 14 to Feb 11Feb 25 to Mar 18Apr 8
West JordanJan 24 to Feb 21Mar 7 to Mar 28Apr 18
ProvoJan 24 to Feb 21Mar 7 to Mar 28Apr 18
St. GeorgeDec 20 to Jan 17Jan 31 to Feb 21Mar 14
LehiFeb 5 to Mar 5Mar 19 to Apr 9Apr 30
OremJan 25 to Feb 22Mar 8 to Mar 29Apr 19
SandyFeb 4 to Mar 4Mar 18 to Apr 8Apr 29
OgdenJan 27 to Feb 24Mar 10 to Mar 31Apr 21
South JordanJan 24 to Feb 21Mar 7 to Mar 28Apr 18
LaytonFeb 4 to Mar 4Mar 18 to Apr 8Apr 29
Eagle MountainMar 10 to Apr 7Apr 21 to May 12Jun 2
MillcreekJan 31 to Feb 28Mar 14 to Apr 4Apr 25
HerrimanJan 24 to Feb 21Mar 7 to Mar 28Apr 18
Saratoga SpringsFeb 5 to Mar 5Mar 19 to Apr 9Apr 30
TaylorsvilleJan 6 to Feb 3Feb 17 to Mar 10Mar 31
LoganFeb 13 to Mar 13Mar 27 to Apr 17May 8
MurrayFeb 4 to Mar 4Mar 18 to Apr 8Apr 29
DraperJan 24 to Feb 21Mar 7 to Mar 28Apr 18
Spanish ForkJan 31 to Feb 28Mar 14 to Apr 4Apr 25
RivertonJan 24 to Feb 21Mar 7 to Mar 28Apr 18
BountifulJan 31 to Feb 28Mar 14 to Apr 4Apr 25
TooeleFeb 7 to Mar 7Mar 21 to Apr 11May 2
Cedar CityFeb 9 to Mar 9Mar 23 to Apr 13May 4
American ForkJan 23 to Feb 20Mar 6 to Mar 27Apr 17
SyracuseJan 28 to Feb 25Mar 11 to Apr 1Apr 22
RoyJan 28 to Feb 25Mar 11 to Apr 1Apr 22
Pleasant GroveJan 23 to Feb 20Mar 6 to Mar 27Apr 17
WashingtonDec 20 to Jan 17Jan 31 to Feb 21Mar 14
MidvaleFeb 4 to Mar 4Mar 18 to Apr 8Apr 29
SpringvilleJan 24 to Feb 21Mar 7 to Mar 28Apr 18
KearnsJan 14 to Feb 11Feb 25 to Mar 18Apr 8
MagnaJan 9 to Feb 6Feb 20 to Mar 13Apr 3
ClearfieldFeb 4 to Mar 4Mar 18 to Apr 8Apr 29
KaysvilleJan 25 to Feb 22Mar 8 to Mar 29Apr 19
Cottonwood HeightsFeb 4 to Mar 4Mar 18 to Apr 8Apr 29
HolladayFeb 4 to Mar 4Mar 18 to Apr 8Apr 29
South Salt LakeJan 6 to Feb 3Feb 17 to Mar 10Mar 31
FarmingtonJan 25 to Feb 22Mar 8 to Mar 29Apr 19
HurricaneJan 7 to Feb 4Feb 18 to Mar 11Apr 1
West HavenJan 28 to Feb 25Mar 11 to Apr 1Apr 22
PaysonFeb 9 to Mar 9Mar 23 to Apr 13May 4
ClintonJan 28 to Feb 25Mar 11 to Apr 1Apr 22
North Salt LakeJan 30 to Feb 27Mar 13 to Apr 3Apr 24
North OgdenJan 25 to Feb 22Mar 8 to Mar 29Apr 19
HighlandFeb 8 to Mar 8Mar 22 to Apr 12May 3
Brigham CityFeb 10 to Mar 10Mar 24 to Apr 14May 5

Questions

When should I plant onions in Utah?

In Salt Lake City, plant out from February 17 to March 10. Across Utah the window opens between January 31 and April 21, depending on the local last frost.

How is this date worked out?

Start seeds indoors 8–12 weeks before the last frost; plant out 3–6 weeks before the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Utah

Onions in other states

Frost dates for every city in Utah