When to Plant in Boise, ID
Boise's high-desert climate is excellent for gardening — Zone 7a/7b with a last frost around May 5. Hot, dry summers are perfect for tomatoes and peppers that struggle in the Pacific Northwest's maritime climate. Boise gets about 200+ sunny days per year.
Irrigation is the main challenge in Boise gardening. The city gets only 12 inches of rain per year, with essentially none from June through September. But the sunny days and warm temperatures produce exceptional summer vegetables.
FAQ
When is the last frost date in Boise, ID?
Boise's average last frost date is around May 5. The Treasure Valley's warmer microclimate makes Boise one of Idaho's earliest planting areas.
Is Boise good for tomatoes?
Excellent! Boise's hot, sunny summers produce outstanding tomatoes. Unlike Western Oregon and Washington, Boise has the heat that tomatoes need to ripen fully and abundantly.
How much do I need to water in Boise?
A lot — Boise gets almost no rain from June through September. Drip irrigation or deep watering 2–3 times per week is essential. Mulch heavily to retain moisture.
How does Plan My Garden help Boise gardeners?
Enter your Boise zip code for planting dates calibrated to the Treasure Valley's sunny, dry climate and frost dates.
Frost dates for Boise ZIP codes
Other city guides in Idaho
Published crop guides
- Arugula
- Basil
- Beans
- Beets
- Bok Choy
- Broccoli
- Brussels Sprouts
- Butternut Squash
- Cabbage
- Cantaloupe
- Carrots
- Cauliflower
- Celery
- Chives
- Cilantro
- Collard Greens
- Cucumbers
- Dill
- Eggplant
- Garlic
- Kale
- Kohlrabi
- Lettuce
- Melons
- Okra
- Onions
- Oregano
- Parsley
- Peas
- Peppers
- Potatoes
- Pumpkins
- Radishes
- Rosemary
- Sage
- Scallions
- Spinach
- Strawberries
- Sweet Corn
- Swiss Chard
- Thyme
- Tomatoes
- Turnip
- Zucchini