FrostCal

When to Plant Dahlias in Wyoming

In a typical Wyoming location, plant outdoors May 24 – Jun 7. Across the state, the outdoor planting window starts as early as May 11 in Worland and as late as Jun 19 in Evanston. 1 city in Wyoming is essentially frost-free and can plant on a year-round schedule.

Method Plant out (slips, crowns, or tubers)
Days to maturity 90–120 days

Plant tubers 1-3 weeks after last frost once soil is warm (60F+); very frost-sensitive.

Dahlias Planting Dates by City

CityPlant outdoors
CheyenneMay 21 – Jun 4
CasperMay 17 – May 31
GilletteMay 22 – Jun 5
LaramieJun 14 – Jun 28
Rock SpringsMay 31 – Jun 14
SheridanMay 28 – Jun 11
Green RiverMay 31 – Jun 14
EvanstonJun 19 – Jul 3
RivertonMay 19 – Jun 2
JacksonFrost-free: year-round planting
CodyMay 19 – Jun 2
RawlinsMay 24 – Jun 7
LanderMay 25 – Jun 8
TorringtonMay 18 – Jun 1
DouglasMay 26 – Jun 9
PowellMay 26 – Jun 9
RanchettesMay 19 – Jun 2
WorlandMay 11 – May 25
BuffaloMay 31 – Jun 14
South GreeleyMay 21 – Jun 4

Showing the 20 most populous of 20 Wyoming cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Wyoming cities.

Frequently Asked Questions

When should I plant dahlias in Wyoming?

In a typical Wyoming location, plant outdoors May 24 – Jun 7. Across the state, the outdoor planting window starts as early as May 11 in Worland and as late as Jun 19 in Evanston. 1 city in Wyoming is essentially frost-free and can plant on a year-round schedule.

When is the last frost in Wyoming?

The average last spring frost in Wyoming ranges from May 4 in Worland to June 12 in Evanston, based on NOAA 1991–2020 climate normals.

How long do dahlias take to grow?

Dahlias typically take 90–120 days from planting to harvest. Plant tubers 1-3 weeks after last frost once soil is warm (60F+); very frost-sensitive.

Other Crops in Wyoming

When to plant dahlias in other states

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