Late-Fall Planting in the Willamette Valley, Oregon

Plant as Long as the Ground Isn't Frozen

In the mild Willamette Valley (Zone 8b), you can plant hardy trees, shrubs, and perennials well into winter—often through December—provided the soil is workable (not frozen solid).

Key Points

• Roots need unfrozen soil to establish before spring.
• Fall rains provide natural irrigation.
• Mulch heavily (3–4 inches) to moderate soil temperature.
• Water at planting; then only during dry spells.

Exceptions

Avoid planting marginally hardy species (e.g., zone 9 plants) late. Stick to Zone 8 or colder ratings.

If a hard freeze is forecast, delay until thaw.