When to plant radishes in Colorado

Radishes
Sow outdoors in Denver
Mar 30–May 11

Across Colorado the window opens between March 10 and April 5. Find your city below; the dates follow each town's own average last frost.

Sow outdoors, Denver
Mar 30–May 11
Fall planting, Denver
Aug 27–Sep 10
Last frost, Denver
May 4

Sow outdoors from 5 weeks before to 1 weeks after the last frost; sow again for fall 4–6 weeks before the first frost. The fastest crop in the garden. Sow a short row every week in spring and fall.

Radishes planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
DenverMar 30–May 11
Colorado SpringsMar 29–May 10
AuroraApr 2–May 14
Fort CollinsMar 28–May 9
LakewoodMar 29–May 10
ThorntonMar 28–May 9
ArvadaMar 31–May 12
WestminsterMar 28–May 9
GreeleyMar 28–May 9
PuebloMar 26–May 7
CentennialMar 31–May 12
BoulderApr 1–May 13
LongmontApr 2–May 14
LovelandApr 5–May 17
BroomfieldMar 28–May 9
Commerce CityMar 29–May 10
Grand JunctionMar 10–Apr 21
LittletonMar 28–May 9
BrightonMar 29–May 10
WindsorMar 29–May 10
ErieApr 2–May 14
NorthglennMar 28–May 9
Security-WidefieldMar 29–May 10
EnglewoodMar 28–May 9
Pueblo WestMar 22–May 3
Wheat RidgeMar 31–May 12
LafayetteMar 28–May 9
FountainMar 29–May 10
EvansMar 28–May 9
JohnstownApr 5–May 17
All 34 cities
CitySow outdoorsFall plantingLast frost
DenverMar 30 to May 11Aug 27 to Sep 10May 4
Colorado SpringsMar 29 to May 10Aug 27 to Sep 10May 3
AuroraApr 2 to May 14Aug 27 to Sep 10May 7
Fort CollinsMar 28 to May 9Aug 26 to Sep 9May 2
LakewoodMar 29 to May 10Aug 26 to Sep 9May 3
ThorntonMar 28 to May 9Aug 30 to Sep 13May 2
ArvadaMar 31 to May 12Aug 24 to Sep 7May 5
WestminsterMar 28 to May 9Aug 30 to Sep 13May 2
GreeleyMar 28 to May 9Aug 27 to Sep 10May 2
PuebloMar 26 to May 7Aug 28 to Sep 11Apr 30
CentennialMar 31 to May 12Aug 27 to Sep 10May 5
BoulderApr 1 to May 13Aug 24 to Sep 7May 6
LongmontApr 2 to May 14Aug 24 to Sep 7May 7
LovelandApr 5 to May 17May 10
BroomfieldMar 28 to May 9Aug 30 to Sep 13May 2
Commerce CityMar 29 to May 10Aug 26 to Sep 9May 3
Grand JunctionMar 10 to Apr 21Sep 11 to Sep 25Apr 14
LittletonMar 28 to May 9Aug 30 to Sep 13May 2
BrightonMar 29 to May 10Aug 26 to Sep 9May 3
WindsorMar 29 to May 10Aug 25 to Sep 8May 3
ErieApr 2 to May 14Aug 24 to Sep 7May 7
NorthglennMar 28 to May 9Aug 30 to Sep 13May 2
Security-WidefieldMar 29 to May 10Aug 27 to Sep 10May 3
EnglewoodMar 28 to May 9Aug 30 to Sep 13May 2
Pueblo WestMar 22 to May 3Sep 1 to Sep 15Apr 26
Wheat RidgeMar 31 to May 12Aug 24 to Sep 7May 5
LafayetteMar 28 to May 9Aug 30 to Sep 13May 2
FountainMar 29 to May 10Aug 27 to Sep 10May 3
EvansMar 28 to May 9Aug 27 to Sep 10May 2
JohnstownApr 5 to May 17May 10
Four Square MileApr 2 to May 14Aug 27 to Sep 10May 7
MontroseMar 24 to May 5Sep 2 to Sep 16Apr 28
LouisvilleApr 1 to May 13Aug 24 to Sep 7May 6
FirestoneApr 2 to May 14Aug 24 to Sep 7May 7

Questions

When should I plant radishes in Colorado?

In Denver, sow outdoors from March 30 to May 11. Across Colorado the window opens between March 10 and April 5, depending on the local last frost.

How is this date worked out?

Sow outdoors from 5 weeks before to 1 weeks after the last frost; sow again for fall 4–6 weeks before the first frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Colorado

Radishes in other states

Frost dates for every city in Colorado