Growing Zones
Utah Growing Zones
Growing zones help gardeners understand which plants can survive their region’s climate. They are especially helpful when choosing trees, shrubs, perennials, fruits, vegetables, and landscape plants for Utah and the Mountain West.
Planting zones, also called growing zones or hardiness zones, are based on average annual minimum winter temperatures. These zones give gardeners a starting point for understanding which plants are most likely to survive winter in their area.
What Are Growing Zones?
USDA Cold Hardiness Zones
Planting zones, also called growing zones, are illustrated on a map known as the USDA Plant Hardiness Zone Map. The U.S. Department of Agriculture divides the country into zones ranging from 1A to 13B. These zones are based on average minimum winter temperatures, ranging from -60 degrees Fahrenheit to 70 degrees Fahrenheit.
Know your growing zone. Growing zones help gardeners understand which plants can survive their region’s climate.
Click the link below, enter your ZIP code, and your hardiness growing zone will be displayed.
Resources — Cold Hardiness Zones:
Why Growing Zones Matter
Utah has a wide range of elevations, temperatures, and microclimates. A plant that grows well in one Utah city may struggle in another. Knowing your growing zone helps you make better choices before planting.
Growing zones can help you decide:
- Which trees and shrubs are likely to survive winter
- Which perennials are best suited for your area
- When to plant certain crops
- How much winter protection some plants may need
- Which plants may be risky in colder or hotter locations
Utah Has Many Microclimates
Even within the same city, growing conditions can vary. South-facing walls, protected courtyards, wind exposure, shade, elevation, slope, soil type, and nearby pavement can all create warmer or cooler microclimates.
A protected backyard may allow you to grow plants that would struggle in an exposed front yard. A windy, open location may feel much colder and drier than the official zone suggests.
AHS Heat Zones
Heat zones are the high-temperature equivalent of cold hardiness zones. The American Horticultural Society developed a Plant Heat Zone Map that divides the country into twelve numbered zones.
Heat zones are based on the average number of “heat days” per year — days when temperatures rise above 86°F. Areas with the fewest heat days are in zone 1, while areas with the most heat days are in zone 12.
Sunset Climate Zones
A plant’s performance is governed by the total climate, including length of growing season, timing and amount of rainfall, winter lows, summer highs, wind, and humidity.
Sunset climate zone maps take all these factors into account. Unlike USDA hardiness zones, which focus mostly on winter lows, Sunset zones look at the broader growing conditions that affect plant success.
Use Zones as a Guide, Not a Guarantee
Growing zones are useful, but they do not tell the whole story. They do not account for summer heat, drought, soil conditions, wind, late spring freezes, early fall frosts, or watering habits.
For best results, combine your growing zone with local frost dates, soil health, water availability, and real-world experience from successful gardeners in your area.
Tips for Choosing Plants in Utah
- Choose plants rated for your growing zone or colder.
- Pay attention to water needs, not just cold hardiness.
- Use native and water-wise plants when possible.
- Protect tender plants from late spring frosts.
- Consider wind, sun exposure, and reflected heat.
- Ask local nurseries and experienced gardeners what performs well nearby.
Final Thought
Knowing your growing zone gives you a stronger starting point, but successful gardening in Utah also means understanding your own yard. Watch your sun, wind, soil, water, and frost patterns. The more you observe, the better your garden will grow.