Utah planting calendar

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

Utah is mostly USDA zone 6b (range 4a-9a). Dates below are derived from garlic's frost tolerance and Utah's frost window — not generic national averages.

Garlic planting timetable for Utah

Stage	When in Utah	Anchor
Plant cloves outdoors	late August — mid-September (September 10)	~35 days before Utah's first fall frost (mid-October (Wasatch Front))
First harvest	early May 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 Utah's climate shifts the garlic dates

Utah's first fall frost averages mid-October (Wasatch Front), which sets the autumn planting clock — cloves need 4-6 weeks of root growth before the ground freezes. Utah ranges from alpine mountains to warm southern desert. Elevation and aridity drive plant choice; the Wasatch Front has the main growing belt.

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 Uinta and central mountains (zone 4a) mulch heavily with 10-15 cm of straw to stop freeze-thaw heaving.

Regional variation within Utah

the high Uinta and central mountains (zone 4a) should plant at the earlier end of the window and grow hardneck types; the southwest Dixie around St. George (zone 9a) can plant later and lean on softneck varieties.

Salt Lake City — USDA zone 7a
Provo — USDA zone 7a
St. George — USDA zone 8b
Ogden — USDA zone 7a
Logan — USDA zone 6a

What else to plant in Utah 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 Utah?

In Utah (mostly USDA zone 6b), plant garlic cloves outdoors around late August — mid-September — roughly 35 days before the first fall frost (mid-October (Wasatch Front)). Cloves root through autumn, overwinter, then bulb up by early May 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 Utah?

Most of Utah sits in USDA hardiness zone 6b, with the state spanning roughly 4a-9a from the high Uinta and central mountains (zone 4a) to the southwest Dixie around St. George (zone 9a). The last spring frost averages late April (Wasatch Front) and the first fall frost mid-October (Wasatch Front).

Can you grow garlic in Utah?

Yes. Utah's dominant zone 6b 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 Utah?

What else can I plant in Utah 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.