idaho falls planting zone

Idaho Falls Planting Zone: A Gardener's Guide

By Ashley MartinFebruary 23, 2026

Nestled in the heart of Idaho, Idaho Falls is a city that experiences a unique blend of weather patterns, creating a distinct planting zone. Understanding this zone is crucial for gardeners and landscapers to ensure their plants thrive. Idaho Falls falls under the USDA Plant Hardiness Zone Map, which divides the United States into 11 zones based on the average annual minimum winter temperature.

Idaho Falls is situated in Plant Hardiness Zone 5b, which means the average annual minimum winter temperature ranges from -15°F to -10°F (-26°C to -23°C). This zone is characterized by long, cold winters and warm summers, making it essential to choose plants that can withstand these conditions.

Understanding Plant Hardiness in Idaho Falls

Plant hardiness is a plant's ability to withstand cold temperatures. In Idaho Falls, understanding the hardiness of plants is crucial for selecting the right species for your garden. The USDA has assigned a hardiness rating to most plants, represented by a number between 0 and 13, with 0 being the coldest and 13 the warmest.

Idaho Planting Zones - Growing Zones Guide

For Idaho Falls, plants with a hardiness rating of 5 or lower are not likely to survive the winter. Therefore, it's essential to choose plants with a hardiness rating of 5 or higher to ensure they can withstand the cold temperatures.

Choosing the Right Trees and Shrubs

When selecting trees and shrubs for your Idaho Falls garden, look for those with a hardiness rating of 5 or higher. Some popular options include:

the zone 6 planting schedule is shown in this graphic, it shows where plants are grown

Treasure Valley Idaho Spring Planting Guide

Scary Idaho Garden Plants You Should Know

Trees: Flowering Dogwood (Cornus florida), Red Maple (Acer rubrum), and River Birch (Betula nigra)
Shrubs: Hydrangea (Hydrangea spp.), Spirea (Spiraea spp.), and Potentilla (Potentilla spp.)

Selecting Perennials and Annuals

Perennials and annuals also play a significant role in Idaho Falls gardens. For perennials, look for those with a hardiness rating of 5 or higher, such as:

Black-Eyed Susan (Rudbeckia hirta)
Daylily (Hemerocallis spp.)
Catmint (Nepeta x faassenii)

For annuals, which only live for one growing season, you can choose from a wide variety of plants, as they can be selected based on their ability to thrive in Idaho Falls' summer conditions rather than their hardiness rating.

Preparing Your Garden for Idaho Falls' Climate

To ensure your plants thrive in Idaho Falls, it's essential to prepare your garden for the unique climate. This includes:

Idaho Landscapes & Gardens | University of Idaho Extension

Fall Planting Guide For Your Zone-Zone 7

Utah Planting Zones - Growing Zone Map | Gilmour

What Your USDA Hardiness Zone Actually Means for Your Garden

Forest Types in Idaho · Idaho Forests Products Commission

Soil Preparation

Idaho Falls has a variety of soil types, ranging from sandy to clay. It's crucial to test your soil's pH and nutrient levels and amend it as needed to create a healthy growing environment for your plants.

Watering and Mulching

Proper watering and mulching are essential for maintaining healthy plants in Idaho Falls. Water your plants consistently, especially during the summer months, and apply a layer of organic mulch around the base of your plants to help retain moisture and regulate soil temperature.

In Idaho Falls, understanding and embracing the unique planting zone can lead to a thriving, beautiful garden. By selecting the right plants and preparing your garden for the climate, you can create a landscape that not only survives but also flourishes in this wonderful city.