Utah planting calendar

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

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

Asparagus planting timetable for Utah

Stage	When in Utah	Anchor
Direct-sow outside	early April (April 4)	21 days before the last frost (late April (Wasatch Front))
First harvest (estimate)	early April (April 3)	~730 days from direct sow

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 asparagus dates

Utah's last spring frost averages late April (Wasatch Front) and first fall frost mid-October (Wasatch Front), which sets the whole planting clock. Utah ranges from alpine mountains to warm southern desert. Elevation and aridity drive plant choice; the Wasatch Front has the main growing belt. Wait for warm soil — asparagus stall in cold ground even after the air warms, so don't rush them out.

Asparagus is almost always established from year-old crowns rather than seed; plant them in a prepared trench 20-30 cm deep as soon as the soil can be worked in early spring, 2-3 weeks before the last frost. Do not harvest at all in year one, harvest sparingly for 2-3 weeks in year two, and from year three onward you can take a full 6-8 week spring harvest. Crowns are reliably cold-hardy to zone 3 but require winter dormancy — they are poorly suited to zones 10-11 where winters are too warm to meet the chilling requirement.

Frost-risk note

Don't plant before late April (Wasatch Front) — a hard freeze can still set young plants back. In the high Uinta and central mountains (zone 4a) the safe date runs a week or two later.

Regional variation within Utah

the high Uinta and central mountains (zone 4a) runs roughly 1-2 weeks behind the state average; the southwest Dixie around St. George (zone 9a) can plant 1-2 weeks earlier.

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

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

Quick-grow guide

Sun: Full sun — 6-8 hours direct.
Soil temperature for germination: Soil 10-18 °C (50-65 °F) at crown planting.
Spacing: 12-18 inches (30-45 cm) between plants.
Days to harvest: ~730 days from planting out.

Frequently asked questions

When is the best time to plant asparagus in Utah?

In Utah (mostly USDA zone 6b), direct-sow asparagus early April (before the last frost, late April), and harvest from early April. Asparagus are cold-hardy — they tolerate frost and actively prefer cool weather, so they go in well before the last spring frost and bolt in summer heat.

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 asparagus in Utah?

Yes. Utah's dominant zone 6b supports asparagus — the key is timing. Asparagus are cold-hardy — they tolerate frost and actively prefer cool weather, so they go in well before the last spring frost and bolt in summer heat.

Does the planting date change across Utah?

the high Uinta and central mountains (zone 4a) runs roughly 1-2 weeks behind the state average; the southwest Dixie around St. George (zone 9a) can plant 1-2 weeks earlier.

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

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

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.