When to Plant Hostas in Oregon
The king of shade gardens. Hostas come in hundreds of varieties and get more beautiful with each passing year.
The Short Answer
Oregon Frost Dates
Your planting dates depend on which part of Oregon you're in. Here are the frost date ranges by region:
| Region | Zones | Last Frost (Spring) | First Frost (Fall) |
|---|---|---|---|
| Willamette Valley | 8a, 8b | Mar 25 - Apr 15 | Oct 15 - Nov 10 |
| Portland Metro | 8b, 9a | Mar 15 - Apr 5 | Oct 25 - Nov 15 |
| Central/Eastern Oregon | 5a, 5b, 6a, 6b | May 10 - Jun 1 | Sep 10 - Oct 1 |
| Southern Oregon Coast | 8b, 9a, 9b | Mar 5 - Mar 25 | Nov 5 - Nov 25 |
Hostas Planting Schedule for Oregon
Willamette Valley (Zones 8a, 8b)
Average last frost: Mar 25 - Apr 15 · Average first frost: Oct 15 - Nov 10
Portland Metro (Zones 8b, 9a)
Average last frost: Mar 15 - Apr 5 · Average first frost: Oct 25 - Nov 15
Central/Eastern Oregon (Zones 5a, 5b, 6a, 6b)
Average last frost: May 10 - Jun 1 · Average first frost: Sep 10 - Oct 1
Southern Oregon Coast (Zones 8b, 9a, 9b)
Average last frost: Mar 5 - Mar 25 · Average first frost: Nov 5 - Nov 25
Growing Hostas in Oregon
Hostas in Oregon's Climate
Hostas grow in the cooler parts of your zone but struggle in the warmest areas. Mountain regions are excellent. Piedmont and urban areas need deep shade and consistent moisture. Choose thick-leaved, heat-tolerant varieties (Sum and Substance, Guacamole) — thin leaves scorch in warm conditions.
Soil Considerations for Oregon
Rich volcanic soils in Willamette Valley. Dry, alkaline soils east of Cascades. Acidic forest soils on coast. Generally excellent for gardening in valleys.
Oregon Climate & Growing Season
Dramatic east-west climate divide. Wet, mild winters west of Cascades. Dry, cold winters east. Year-round gardening possible in mild western valleys. Hostas can handle frost well, which is an advantage in Oregon's climate. You can push planting dates earlier in spring and extend into fall.
Growing season length varies across Oregon: Willamette Valley (8a, 8b) has a last frost around Mar 25 - Apr 15, while Southern Oregon Coast (8b, 9a, 9b) sees frost end around Mar 5 - Mar 25. This difference matters for hostas — adjust your planting dates to match your specific region.
Growing Tips
Plant divisions or nursery plants in spring or fall. Slugs are the main enemy — use iron phosphate bait. Mulch to retain moisture.
Companion Planting
Plant hostas alongside these companions for better growth:
The Bottom Line
Last reviewed: March 29, 2026