When to Plant in Utah: A Month-by-Month Calendar

Frost dates, soil temps, and the right window for trees, perennials, bulbs, and seed on the Wasatch Front.

7 min read · Updated June 25, 2026

Utah's seasons don't match the back of the seed packet. Our last spring frost lingers into May and the first fall frost arrives by mid-October, which leaves a specific window for everything you plant. Get the timing right and plants establish themselves; get it wrong and you replace them. Here's the month-by-month calendar for the Wasatch Front.

Early–mid May

Average last spring frost (valleys)

Mid-October

Average first fall frost

Fall

Prime window for trees & spring bulbs

Soil temp

Beats the calendar for seeding

The dates everything hinges on

Two dates anchor the Utah planting year. On the valley floor of the Wasatch Front, the average last spring frost is around early-to-mid May, and the first fall frost is around mid-October — roughly a five-month frost-free season. Benches and higher elevations shift later in spring and earlier in fall, so treat these as a baseline and adjust for your microclimate.

The Wasatch Front planting calendar

Valley-floor timing; adjust later for benches and higher elevations.
Month / window	What to plant	Notes
March	Bare-root trees & shrubs; cool-season seed (peas, spinach, lettuce) once soil is workable	Soil is often still cold and wet — work it only when it crumbles, not when it smears
April	Cool-season vegetables; perennials; pansies; fescue lawn seed	Hardy perennials establish well in cool, moist soil before summer heat
Early–mid May	Last-frost line — hold tender plants until it passes	Watch the forecast; a mid-May frost is not unusual
Mid–late May	Warm-season crops (tomatoes, peppers, squash); annual flowers; summer & tender bulbs (dahlias)	Wait for soil near 60°F before warm-season seed and transplants
June–August	Container-grown perennials and shrubs with diligent watering; succession cool-season seed in late summer	Avoid planting trees in peak heat; if you do, water deeply and consistently
September	Trees & shrubs (prime window); cool-season vegetables; fescue lawn seed	Warm soil + cooling air = excellent root establishment before winter
October	Trees & shrubs until ground freezes; spring-blooming bulbs (tulips, daffodils, crocus)	First-frost line mid-month; bulbs need the cold winter to bloom
November–February	Dormant season — plan, amend frozen-off beds in mild spells, prune dormant trees	No active planting; dormant pruning of many deciduous trees is fine

Read the soil, not just the calendar

For anything grown from seed, soil temperature is the real signal. Cool-season crops and grasses germinate in soil around 45–55°F — the early-spring and early-fall windows. Warm-season crops want soil near 60°F and rising, which on the Wasatch Front usually means mid-to-late May, not the first warm afternoon in April. A cheap soil thermometer in the morning beats guessing; cold, wet soil rots seed regardless of the date on the packet.

After you plant

Timing gets the plant in the ground; what happens next keeps it alive. New plantings need consistent water through their establishment season, the right mulch, and a maintenance rhythm that follows the same Utah seasons. Pair this calendar with the Utah yard maintenance calendar so planting and care stay in step all year.

Utah planting calendar FAQ

When is the last frost in Utah?

On the Wasatch Front valleys, the average last spring frost falls around early-to-mid May, and the first fall frost around mid-October. These are averages — a late cold snap into mid-May happens, so wait for it to pass before setting out frost-tender plants like tomatoes and basil. Higher-elevation and bench areas run later in spring and earlier in fall, so adjust for your specific microclimate.

Is spring or fall better for planting trees in Utah?

Both work, and fall is often the quieter winner. Fall planting (roughly September into October, before the ground freezes) lets roots establish in still-warm soil with less heat stress, so the tree is ready to push growth in spring. Spring planting also works well if you keep new trees consistently watered through their first hot summer. Avoid planting in the heat of midsummer.

When do I plant spring bulbs in Utah?

Plant spring-blooming bulbs — tulips, daffodils, crocus — in fall, generally October, after the soil has cooled but before it freezes. They need that cold winter period to bloom. Summer-blooming bulbs and tender bulbs like dahlias go in after the last spring frost in May.

What's the difference between cool-season and warm-season planting?

Cool-season crops and grasses (lettuce, peas, spinach, fescue) tolerate frost and prefer the cooler soil of early spring and fall. Warm-season ones (tomatoes, peppers, squash, warm-season grasses) need both the last frost to pass and the soil to warm before they'll grow, so they go in from mid-to-late May. Planting warm-season plants into cold soil just stalls them.

How do I know if the soil is warm enough to plant?

Soil temperature matters more than the calendar for seeds. Cool-season crops germinate in soil around 45–55°F; warm-season crops want roughly 60°F and up. A cheap soil thermometer pushed a couple inches into the bed in the morning tells you far more than the date — cold, wet spring soil rots seed no matter what the packet says.

Horticulture and timing guidance per USU Extension. Verified June 2026.

Who publishes this guide

This site is researched and published by Xperience Landscaping, a landscaping company based in Midvale, UT serving the Salt Lake Valley & Utah County. We write it because we install this work every week — and because no one had pulled Utah's scattered, often-outdated landscaping information into one honest place. Figures are verified against primary sources and dated; we'll always tell you to confirm a rebate or code with your district or city before you rely on it.

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