Idaho Gardening Guide (2026)
High desert and mountain valleys; cold nights, hot days, short season.
Quick answer (Idaho): Most of the state gardens in USDA zones 3–7 with about a 144-day frost-free window. Plan around the typical last frost of 05/10; start warm-season crops indoors ~6 weeks earlier. Source: USDA Plant Hardiness Zone Map (2023) + state cooperative extension typical freeze dates.
Your Idaho planting calendar
Pre-filled for Idaho. Pick a crop to see indoor start, sow/transplant, and harvest dates you can print.
In Idaho (typical zone 3–7), last frost ≈ May 10, first frost ≈ Oct 1 (144-day season), your Tomato plan:
Month-by-month (Idaho, 2026)
| Month | Action |
|---|---|
| Jan | — |
| Feb | — |
| Mar | Start indoors |
| Apr | — |
| May | Sow · Transplant |
| Jun | — |
| Jul | — |
| Aug | Harvest |
| Sep | — |
| Oct | — |
| Nov | — |
| Dec | — |
Start indoors 6 weeks before last frost; transplant after soil warms. Zones 3–13 suitable. Dates are typical; confirm with your county extension and watch the 10-day forecast.
Lawns in Idaho
Best grass types for your climate:
Open the lawn care scheduler →
Common pests in Idaho
The pests most reported in your region, with organic-first treatments:
Cutworm
What grows well in Idaho
Crops suitable for zones 3–7:
| Crop | Type | Spacing | Days to harvest |
|---|---|---|---|
| Tomato | Warm-season | 24″ | 70 |
| Pepper | Warm-season | 18″ | 75 |
| Lettuce | Cool-season | 8″ | 45 |
| Carrot | Cool-season | 3″ | 65 |
| Green Beans | Warm-season | 4″ | 55 |
| Spinach | Cool-season | 6″ | 40 |
| Cucumber | Warm-season | 12″ | 55 |
| Zucchini | Warm-season | 36″ | 50 |
| Kale | Cool-season | 12″ | 55 |
| Broccoli | Cool-season | 18″ | 70 |
Figures are typical (30-year normals) from USDA and state extension services. Always confirm your local last/first freeze and product labels with your county extension before acting.