FrostCal

When to Plant Tomatoes in Wyoming

In a typical Wyoming location, start seeds indoors Mar 22 – Apr 5, then transplant outdoors May 24 – May 31. 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 Start indoors, then transplant
Days to maturity 60–85 days

Start indoors 6-8 weeks before last frost; transplant out 1-2 weeks after last frost once soil has warmed.

Tomatoes Planting Dates by City

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

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 tomatoes in Wyoming?

In a typical Wyoming location, start seeds indoors Mar 22 – Apr 5, then transplant outdoors May 24 – May 31. 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 tomatoes take to grow?

Tomatoes typically take 60–85 days from planting to harvest. Start indoors 6-8 weeks before last frost; transplant out 1-2 weeks after last frost once soil has warmed.

Other Crops in Wyoming

When to plant tomatoes in other states

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