Boise's High Desert Climate
Boise sits at the edge of the high desert with hot, dry summers and cold winters. The low humidity is a blessing - far fewer fungal diseases than humid climates. However, the dry air means constant attention to watering.
Challenges:
- Extreme heat in July-August
- Low humidity dries soil fast
- Short growing season (155 days)
- Late spring frosts possible
- Alkaline soil (add sulfur)
Advantages:
- Hot summers = great tomatoes
- Low humidity = fewer diseases
- Cool nights improve flavor
- Excellent for peppers
- Strong local food movement
Best Plants for Boise
Tomatoes
Early varieties: Early Girl, Stupice. Plant May 15.
Peppers
All types thrive. Hot peppers especially.
Beans
Bush beans, multiple plantings June-July.
Squash
Summer squash, zucchini. Direct sow June.
Herbs
Mediterranean herbs (rosemary, thyme) love it.
Greens
Spring and fall only. Too hot in summer.
Watering in Boise's Dry Climate
- Drip irrigation: Essential for Boise. Hand watering in summer heat is exhausting.
- Mulch heavily: 2-3 inches straw or wood chips reduces evaporation
- Water deeply: Soak thoroughly less often rather than shallow daily
- Morning watering: Reduces evaporation loss from afternoon heat
- Self-watering containers: Highly recommended for Boise's dry summers
Where to Buy in Boise
Nurseries
- • Edwards Greenhouse
- • Franz Witte Nursery
- • Zamzows
Resources
- • U of Idaho Extension
- • Boise Farmers Market
- • Idaho Botanical Garden