Last and first frost dates in Cheyenne

When is the last frost in Cheyenne?

The last frost in Cheyenne usually comes around 12 May: that is the median of 2016–2025, so in about half of those years the last night at or below 0 °C came later. Hardy crops start before it and frost-tender ones only after it: in the table below arugula can go into open ground from 21 April, while corn waits until 19 May. The first autumn frost follows around 13 October, about 154 days later: harvest or cover frost-tender crops before then.

When to sow and plant

Planting out: a week after the last frost once the soil is warm enough for the crop; frost-hardy crops three weeks before it; an unheated greenhouse three weeks earlier. Seedlings are sown so they are ready on that day. Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

What planting zone is Cheyenne?

The official USDA map (2023, 1991–2020 data) puts the centre of Cheyenne (ZIP 82001) in zone 5b. Zone 5b stands for an average coldest night of -15 to -10 °F (-26.1 to -23.3 °C), so perennials hardy to zone 5b or a colder zone should come through a typical winter here.

Check the official USDA map for Cheyenne: USDA Plant Hardiness Zone Map.

When the soil warms up in Cheyenne

The day the top 7 cm of soil first averages each temperature over a week, median of 2016–2025 (ERA5 via Open-Meteo). The soil reaches 10 °C 23 days before the last spring frost and 15 °C 13 days after it.

Frost dates near Cheyenne

Of the nearest cities on our list, the last spring frost ends earliest in Pueblo (21 April) and latest in Casper (26 May).

Seeds, seedlings and markets in Cheyenne

Within 15 km of Cheyenne OpenStreetMap lists 3 garden centres and 1 farm shop (collected 20 October 2026). The nearest garden centre to the city centre is River Bend Nursery and Stone, 7 km away.

• River Bend Nursery and Stone — garden centre
  Yellowstone Road 8908, 82009 Cheyenne · 7 km · riverbendnurseryandstone.com
• WY fresh — farm shop
  Walterscheid Boulevard 200, 82007-2352 Cheyenne · 3 km

• Where to buy seeds and seedlings in Cheyenne
• Selling your own harvest in the United States

Places: © OpenStreetMap contributors, ODbL.

Weather in Cheyenne by month

Average weather in Cheyenne over 2016–2025: the warmest month is July. Months that average 20 °C or more by day: June–September (25.1–29.5 °C). Nights average below 0 °C in November–April (-6.8–-0.3 °C). About 401 mm of rain falls in a year, on 85 days; May is the wettest month (87 mm) and December the driest (15 mm).

Average of the daily highs and lows, rain per month and days with at least 1 mm (ERA5 via Open-Meteo, the same grid cell as the frost dates).

Planted in autumn

From a month before the first autumn frost, so the roots grow before winter, to the late-planting limit on each crop’s page (about two weeks before the ground freezes, by ten years of weather).