FrostCal

When to Plant Watermelon in Wyoming

In a typical Wyoming location, start seeds indoors Apr 19 – Apr 26, then transplant outdoors May 31 – Jun 7. Across the state, the outdoor planting window starts as early as May 18 in Worland and as late as Jun 26 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 70–90 days

Needs warm soil (65F+); start indoors 3-4 weeks before last frost, transplant 2-3 weeks after last frost.

Watermelon Planting Dates by City

CityStart indoorsTransplant
CheyenneApr 16 – Apr 23May 28 – Jun 4
CasperApr 12 – Apr 19May 24 – May 31
GilletteApr 17 – Apr 24May 29 – Jun 5
LaramieMay 10 – May 17Jun 21 – Jun 28
Rock SpringsApr 26 – May 3Jun 7 – Jun 14
SheridanApr 23 – Apr 30Jun 4 – Jun 11
Green RiverApr 26 – May 3Jun 7 – Jun 14
EvanstonMay 15 – May 22Jun 26 – Jul 3
RivertonApr 14 – Apr 21May 26 – Jun 2
JacksonFrost-free: year-round planting
CodyApr 14 – Apr 21May 26 – Jun 2
RawlinsApr 19 – Apr 26May 31 – Jun 7
LanderApr 20 – Apr 27Jun 1 – Jun 8
TorringtonApr 13 – Apr 20May 25 – Jun 1
DouglasApr 21 – Apr 28Jun 2 – Jun 9
PowellApr 21 – Apr 28Jun 2 – Jun 9
RanchettesApr 14 – Apr 21May 26 – Jun 2
WorlandApr 6 – Apr 13May 18 – May 25
BuffaloApr 26 – May 3Jun 7 – Jun 14
South GreeleyApr 16 – Apr 23May 28 – 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 watermelon in Wyoming?

In a typical Wyoming location, start seeds indoors Apr 19 – Apr 26, then transplant outdoors May 31 – Jun 7. Across the state, the outdoor planting window starts as early as May 18 in Worland and as late as Jun 26 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 watermelon take to grow?

Watermelon typically take 70–90 days from planting to harvest. Needs warm soil (65F+); start indoors 3-4 weeks before last frost, transplant 2-3 weeks after last frost.

Other Crops in Wyoming

When to plant watermelon in other states

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