FrostCal

When to Plant Thyme in Wyoming

In a typical Wyoming location, start seeds indoors Mar 22 – Apr 5, then transplant outdoors May 17 – May 24. Across the state, the outdoor planting window starts as early as May 4 in Worland and as late as Jun 12 in Evanston. 1 city in Wyoming is essentially frost-free and can plant on a year-round schedule.

Method Start indoors, then transplant
Days to maturity 85–95 days

Perennial herb, slow from seed; start indoors 6-8 weeks before last frost, transplant around/after last frost.

Thyme Planting Dates by City

CityStart indoorsTransplant
CheyenneMar 19 – Apr 2May 14 – May 21
CasperMar 15 – Mar 29May 10 – May 17
GilletteMar 20 – Apr 3May 15 – May 22
LaramieApr 12 – Apr 26Jun 7 – Jun 14
Rock SpringsMar 29 – Apr 12May 24 – May 31
SheridanMar 26 – Apr 9May 21 – May 28
Green RiverMar 29 – Apr 12May 24 – May 31
EvanstonApr 17 – May 1Jun 12 – Jun 19
RivertonMar 17 – Mar 31May 12 – May 19
JacksonFrost-free: year-round planting
CodyMar 17 – Mar 31May 12 – May 19
RawlinsMar 22 – Apr 5May 17 – May 24
LanderMar 23 – Apr 6May 18 – May 25
TorringtonMar 16 – Mar 30May 11 – May 18
DouglasMar 24 – Apr 7May 19 – May 26
PowellMar 24 – Apr 7May 19 – May 26
RanchettesMar 17 – Mar 31May 12 – May 19
WorlandMar 9 – Mar 23May 4 – May 11
BuffaloMar 29 – Apr 12May 24 – May 31
South GreeleyMar 19 – Apr 2May 14 – May 21

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 thyme in Wyoming?

In a typical Wyoming location, start seeds indoors Mar 22 – Apr 5, then transplant outdoors May 17 – May 24. Across the state, the outdoor planting window starts as early as May 4 in Worland and as late as Jun 12 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 thyme take to grow?

Thyme typically take 85–95 days from planting to harvest. Perennial herb, slow from seed; start indoors 6-8 weeks before last frost, transplant around/after last frost.

Other Crops in Wyoming

When to plant thyme in other states

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