PlantingWindowThe American Planting Almanac

When to plant turnips in Cheyenne, Wyoming

April 16 – April 30

Direct-sow outdoors · typical Cheyenne year

Climate basis: NOAA station Cheyenne Wfo, WY (USC00481676), 7 mi (12 km) from downtown Cheyenne (ZCTA 82001 centroid), elevation 6119 ft, on the 1991–2020 climate normals. Direct-sow turnips from approximately the dates above, anchored to the median last spring 32°F freeze (May 14). One year in ten still freezes after May 28.

Last spring freezeMay 141-in-10 after May 28
First fall freezeOctober 11-in-10 before Sep 17
Frost-free season≈ 139 daysmedian at 32°F
Hard freeze, 28°May 3 – Oct 10kills even hardy greens
USDA zone5b-15 to -10°F winter low — not frost timing

The Cheyenne year

Direct-sow outdoorsApr 16 – Apr 30
Fall plantingAug 6 – Sep 3
  • indoors under lights
  • in the garden
  • frost-free season
  • 1-in-10 years still freeze to May 28
Turnips in Cheyenne · freeze context from Cheyenne Wfo, WY, 1991–2020 normals.

Every method, with its sources

Direct-sow outdoors

Apr 16 – Apr 30

Purdue: hardy — 4–6 weeks before the last frost; Penn State's earliest sowing Apr 3 (−28 days) is the later start and is used. Anchored to the median last spring freeze (May 14). Penn State Extension (York County Master Gardeners) · Purdue University Extension

Fall planting

Aug 6 – Sep 3

Purdue Table 2: plant fall turnips at least 4–8 weeks before the first fall frost. Anchored to the median first fall freeze (Oct 1). Purdue University Extension

Variety assumption: Assumes an average variety (about 45–60 days; Penn State lists 55).

These windows describe typical years (1991–2020 climate normals), not this year's forecast. Freezes happen outside them — especially in frost pockets, valleys, and urban edges. Watch the forecast before committing tender plants.

This week, not a typical year:
Crop rule sources (2)

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