Wyoming planting calendar

When to plant garlic in Wyoming — sow, transplant & harvest dates

Wyoming is mostly USDA zone 4b (range 3a-6a). Dates below are derived from garlic's frost tolerance and Wyoming's frost window — not generic national averages.

Garlic planting timetable for Wyoming

Stage	When in Wyoming	Anchor
Plant cloves outdoors	early August — late August (August 11)	~35 days before Wyoming's first fall frost (mid-September)
First harvest	mid-April the following year	~240 days from autumn planting

Dates are state-wide averages for the dominant zone. Local microclimates — elevation, urban heat, coastal moderation — can shift the window by 1-2 weeks. Use the frost-date calculator for a date tuned to your town.

Why Wyoming's climate shifts the garlic dates

Wyoming's first fall frost averages mid-September, which sets the autumn planting clock — cloves need 4-6 weeks of root growth before the ground freezes. Wyoming is a high, cold, short-season state. Altitude and wind matter as much as the winter low; frost can come in any summer month at elevation.

Garlic is the unusual one — plant cloves in autumn (4-6 weeks before the first hard fall frost) so they put down roots before winter, then break dormancy in spring and bulb up over the long days of early summer. Cold-winter zones grow hardneck varieties; mild-winter zones do better with softneck.

Frost-risk note

Get cloves in before the ground freezes solid; in the high mountain basins like Jackson Hole (zone 3a) mulch heavily with 10-15 cm of straw to stop freeze-thaw heaving.

Regional variation within Wyoming

the high mountain basins like Jackson Hole (zone 3a) should plant at the earlier end of the window and grow hardneck types; the lower southeast plains near Cheyenne (zone 6a) can plant later and lean on softneck varieties.

Cheyenne — USDA zone 5b
Casper — USDA zone 5a
Jackson — USDA zone 4a
Sheridan — USDA zone 5a

What else to plant in Wyoming around then

The same autumn slot suits overwintering onions, shallots, and a final sowing of spinach or mache.

Quick-grow guide

Sun: Full sun — 6+ hours direct.
Soil temperature for germination: Soil 10-15 °C (50-60 °F) at planting.
Spacing: 4-6 inches (10-15 cm) between plants.
Days to harvest: ~240 days from autumn planting.

Frequently asked questions

When is the best time to plant garlic in Wyoming?

In Wyoming (mostly USDA zone 4b), plant garlic cloves outdoors around early August — late August — roughly 35 days before the first fall frost (mid-September). Cloves root through autumn, overwinter, then bulb up by mid-April next year. Garlic is fall-planted — cloves need winter chilling, so they go in the ground in autumn, root before the freeze, and bulb up the following summer.

What USDA zone is Wyoming?

Most of Wyoming sits in USDA hardiness zone 4b, with the state spanning roughly 3a-6a from the high mountain basins like Jackson Hole (zone 3a) to the lower southeast plains near Cheyenne (zone 6a). The last spring frost averages late May and the first fall frost mid-September.

Can you grow garlic in Wyoming?

Yes. Wyoming's dominant zone 4b supports garlic — the key is timing. Garlic is fall-planted — cloves need winter chilling, so they go in the ground in autumn, root before the freeze, and bulb up the following summer.

Does the planting date change across Wyoming?

What else can I plant in Wyoming around the same time?

The same autumn slot suits overwintering onions, shallots, and a final sowing of spinach or mache.

Source and methodology

State zone spans from the USDA Plant Hardiness Zone Map (2023); frost-date averages from NOAA Climate Data Online. Hot-state two-season timing cross-checked against the UF/IFAS Florida Gardening Calendar and the University of Arizona Cooperative Extension planting calendar. Curated by the Growli editorial team.