When to Plant Black-Eyed Susans in Oregon
Cheerful golden blooms that attract butterflies and tolerate drought. A backbone of the low-maintenance perennial garden.
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 |
Black-Eyed Susans 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 Black-Eyed Susans in Oregon
Black-Eyed Susans in Oregon's Climate
Native and perfectly adapted to warm climates. Drought-tolerant once established — ideal for water-wise landscaping. Self-seeds freely. Essential for pollinator gardens and naturalized meadow plantings.
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. Black-Eyed Susans 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 black-eyed susans — but black-eyed susans handle frost well, so the timing difference is less critical.
Growing Tips
Leave seed heads standing through winter for birds and visual interest. Self-seeds freely — deadhead if you don't want more.
Companion Planting
Plant black-eyed susans alongside these companions for better growth:
The Bottom Line
Last reviewed: March 29, 2026