If you live in the state of Idaho and you are planting a garden, you may be wondering what hardiness zone you are in. Idaho is a unique state that has several different hardiness zones. Today you will learn more about each zone, so that you can safely plan your garden this growing season. We’ll discuss the planting zones in Idaho.
Idaho Hardiness Zones
Idaho is unique due to its size and shape of the state. It has several different hardiness zones that you will learn more about below.
Zones 3 to 7
If you live in the great state of Idaho, your location will fall in zones 3 to 7. Depending on which part of the state you live in, will determine when to plant your garden in the spring.
Zone 3
If you live in hardiness zone 3, you should start garden plants indoors for the most part in the months of April and May. During these months you can start plants like beets, cabbage, kale, peppers, and tomatoes. There are a few plants like carrots and peas that will need to be started a little later in the growing season.
Zone 4
If you’re growing a garden in zone 4, you will need to start seedlings indoors in April and May. Some of the plants that you can start at this time include peas, lettuce, onions, spinach, and tomatoes.
If you’re going to plant beans, corn, or cucumbers, you can start those indoors in late May to early June. However, most people plant these varieties directly in the garden from seeds.
Zone 5
For those planting in zone 5, you can start seeds indoors as early as March. This will allow you enough growing time for your plants to be ready for transplanting.
Corn and cucumbers, on the other hand, can be started a little later or be directly sowed in the garden after the last frost.
Zone 6
When planning a garden in zone 6, make sure you start most seeds indoors in March. This will give you a jump start on the growing season. Some seeds can be started a little later like beans and squash.
Zone 7
If you’re lucky enough to live in zone 7, you can start your garden a little early than most. In this part of the state, start seeds indoors in February and March. Some seeds can be started as early as January.
But keep in mind varieties like squash, corn, and cucumbers need to be started a little later due to their growth rates. In many cases, these crops can be planted from seed directly in the garden after the last day of frost.
Idaho Last Frost Date and First Frost Date by City
Follow this guide to determine what the last and first day of frost is in your part of the state.
Boise
The last day of frost in Boise is May 6th and the first day of frost is October 8th.
Caldwell
The last day of frost in Caldwell is May 1st and the first day of frost is October the 3rd.
Coeur d’ Alene
The last day of frost in Coeur d’ Alene is May 23rd and the first day of frost is September 16th.
Idaho Falls
The last day of frost in Idaho Falls is June 17th and the first day of frost is September 3rd.
Lewiston
The last day of frost in Lewiston is May 12th and the first day of frost is September 27th.
Meridian
The last day of frost in Meridian is April 22nd and the first day of frost is October 10th.
Nampa
The last day of frost in Nampa is May 1st and the first day of frost is October 3rd.
Pocatello
The last day of frost in Pocatello is May 30th and the first day of frost is September 19th.
Post Falls
The last day of frost in Post Falls is May 23rd and the first day of frost is September 16th.
Twin Falls
The last day of frost in Twin Falls is May 18th and the first day of frost is September 23rd.
Planting zones in Idaho: Conclusion
Now that you know which hardiness zone you are in, you can begin to plan your garden.
Remember, it is important to follow the guidelines set by each hardiness zone so that your garden will thrive.
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