Montana Gardening Guide (2026)
Short, dry, cold season at altitude. Start indoors; wind protection helps.
Quick answer (Montana): Most of the state gardens in USDA zones 3–6 with about a 123-day frost-free window. Plan around the typical last frost of 05/20; start warm-season crops indoors ~6 weeks earlier. Source: USDA Plant Hardiness Zone Map (2023) + state cooperative extension typical freeze dates.
Your Montana planting calendar
Pre-filled for Montana. Pick a crop to see indoor start, sow/transplant, and harvest dates you can print.
In Montana (typical zone 3–6), last frost ≈ May 20, first frost ≈ Sep 20 (123-day season), your Tomato plan:
Month-by-month (Montana, 2026)
| Month | Action |
|---|---|
| Jan | — |
| Feb | — |
| Mar | — |
| Apr | Start indoors |
| May | — |
| Jun | Sow · Transplant |
| 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 Montana
Best grass types for your climate:
Open the lawn care scheduler →
Common pests in Montana
The pests most reported in your region, with organic-first treatments:
Grasshopper
What grows well in Montana
Crops suitable for zones 3–6:
| 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.