When to plant Green beans in Colorado

In spring, from Apr 10 – June 30 in Grand Junction to May 15 – June 30 in Monument.

In fall, from May 15 – June 15 in Steamboat Springs to July 1 – Aug 1 in Grand Junction.

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

Snap beans planting dates by place in Colorado
PlaceSpringFall
ArvadaMay 10 – June 30June 1 – July 10
AuroraMay 10 – June 30June 15 – July 20
BerthoudMay 10 – June 30June 1 – July 10
BoulderMay 10 – June 30June 1 – July 10
BrightonMay 10 – June 30June 15 – July 20
BroomfieldMay 10 – June 30June 15 – July 20
Cañon CityMay 10 – June 30June 15 – July 20
Castle PinesMay 10 – June 30June 1 – July 10
Castle RockMay 10 – June 30June 1 – July 10
CentennialMay 10 – June 30June 15 – July 20
Colorado SpringsMay 10 – June 30June 15 – July 20
Commerce CityMay 10 – June 30June 15 – July 20
DenverMay 10 – June 30June 15 – July 20
DurangoMay 15 – June 30June 1 – July 10
EnglewoodMay 10 – June 30June 15 – July 20
ErieMay 10 – June 30June 1 – July 10
EvansMay 10 – June 30June 15 – July 20
Federal HeightsMay 10 – June 30June 15 – July 20
FirestoneMay 10 – June 30June 1 – July 10
Fort CollinsMay 10 – June 30June 15 – July 20
Fort MorganMay 10 – June 30June 15 – July 20
FountainMay 10 – June 30June 15 – July 20
FrederickMay 10 – June 30June 1 – July 10
FruitaMay 10 – June 30June 15 – July 20
Glenwood SpringsMay 10 – June 30June 1 – July 10
GoldenMay 10 – June 30June 15 – July 20
Grand JunctionApr 10 – June 30July 1 – Aug 1
GreeleyMay 10 – June 30June 15 – July 20
Greenwood VillageMay 10 – June 30June 15 – July 20
JohnstownMay 10 – June 30June 1 – July 10
LafayetteMay 10 – June 30June 15 – July 20
LakewoodMay 10 – June 30June 15 – July 20
LittletonMay 10 – June 30June 15 – July 20
Lone TreeMay 10 – June 30June 15 – July 20
LongmontMay 10 – June 30June 1 – July 10
LouisvilleMay 10 – June 30June 1 – July 10
LovelandMay 10 – June 30June 1 – July 10
MontroseMay 10 – June 30June 15 – July 20
MonumentMay 15 – June 30June 1 – July 10
NorthglennMay 10 – June 30June 15 – July 20
ParkerMay 10 – June 30June 1 – July 10
PuebloMay 10 – June 30June 15 – July 20
RifleMay 10 – June 30June 1 – July 10
SeveranceMay 10 – June 30June 15 – July 20
Steamboat SpringsNot listedMay 15 – June 15
SterlingMay 10 – June 30June 15 – July 20
SuperiorMay 10 – June 30June 1 – July 10
ThorntonMay 10 – June 30June 15 – July 20
TimnathMay 10 – June 30June 15 – July 20
WellingtonMay 10 – June 30June 15 – July 20
WestminsterMay 10 – June 30June 15 – July 20
Wheat RidgeMay 10 – June 30June 1 – July 10
WindsorMay 10 – June 30June 15 – 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. “—” means the place's frost date is outside the table. The full USDA table for snap beans.