When to Plant in Utah

Utah's gardening is a tale of elevation and aridity. From the high-desert valleys to the mountain plateaus, gardeners must navigate intense sun, low humidity, and a wide range of frost dates to find success.

Water management and soil improvement are the cornerstones of Utah gardening. The state's alkaline soils benefit greatly from organic matter, and consistent irrigation is essential for helping plants thrive in the dry mountain air.

Common Mistakes

Underestimating the day-to-night temperature swing — high-altitude valleys can drop significantly after sunset.
Inconsistent watering — the dry Utah air can pull moisture from plants and soil very quickly.
Not protecting against the sun — young transplants often need temporary shade to prevent scorching.
Neglecting soil pH — Utah's alkaline soils often need amendments to help plants absorb nutrients.

FAQ

What is the last frost date?

Last frost ranges from early May in the warmer valleys to late June in the high mountain regions.

When should I start tomatoes indoors in Utah?

March is generally the best time for indoor starting in the main valleys; April for higher elevations.

Can I plant before the last frost?

Yes, hardy crops like peas, kale, and onions can handle the cool Utah spring.

Why does timing vary so much within Utah?

Elevation is the primary factor, creating massive climate differences over very short distances.

What if I live in a frost-free area?

The St. George area in the far south is nearly frost-free, while the rest of the state has cold winters.

How does Plan My Garden create my schedule?

We factor in your elevation and local climate data to provide a precise and customized planting calendar.