When to Plant Crocus in Oregon

Crocuses (Crocus spp.) are the heralds of spring — small, gem-like blooms that push up through frozen ground or even snow, often weeks before any other flower. Their compact corms naturalize readily in lawns, rock gardens, and borders, creating drifts of purple, white, and yellow that expand year after year. Bees prize early crocus as one of their first nectar and pollen sources of the season. The saffron crocus (C. sativus) blooms in fall and yields the world's most expensive spice.

Oregon spans USDA hardiness zones 6a, 6b, 7a, 7b, 8a, 8b (with planting data available), so planting dates vary by your location within the state. Click your zone below for the most accurate dates.

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Click your county for exact Crocus planting dates based on your local frost dates.

Hover over a county to see details. Click to view planting guide.

Crocus Planting Calendar for Oregon

▸ Zone 6a ~193 day growing season · Full guide →

Last frost: April 10 · First frost: October 20 · 193 day season

Activity	When	Date Range
Bloom	July 28	Jul 28 – Aug 18
Fall Sowing	September 8	Sep 8 – Sep 22

▸ Zone 6b ~205 day growing season · Full guide →

Last frost: April 3 · First frost: October 25 · 205 day season

Activity	When	Date Range
Bloom	August 2	Aug 2 – Aug 23
Fall Sowing	September 13	Sep 13 – Sep 27

▸ Zone 7a ~221 day growing season · Full guide →

Last frost: March 25 · First frost: November 1 · 221 day season

Activity	When	Date Range
Bloom	August 23	Aug 23 – Sep 13
Fall Sowing	September 27	Sep 27 – Oct 11

▸ Zone 7b ~235 day growing season · Full guide →

Last frost: March 18 · First frost: November 8 · 235 day season

Activity	When	Date Range
Bloom	August 30	Aug 30 – Sep 20
Fall Sowing	October 4	Oct 4 – Oct 18

▸ Zone 8a ~255 day growing season · Full guide →

Last frost: March 8 · First frost: November 18 · 255 day season

Activity	When	Date Range
Bloom	September 23	Sep 23 – Oct 14
Fall Sowing	October 21	Oct 21 – Nov 4

▸ Zone 8b ~276 day growing season · Full guide →

Last frost: February 25 · First frost: November 28 · 276 day season

Activity	When	Date Range
Bloom	October 3	Oct 3 – Oct 24
Fall Sowing	October 31	Oct 31 – Nov 14

Growing Tips for Oregon

Plant corms 3–4 inches deep and 2–3 inches apart in fall, when soil temperature drops below 60°F. Mass plantings (at least 25 corms per cluster) create the most visual impact. Plant in well-drained soil — corms rot in standing water. Crocus naturalize well under deciduous trees; the tree leafs out after crocus dormancy begins, so light competition is minimal. Squirrels and chipmunks dig corms — plant deeper (4 inches) or use wire mesh baskets in high-predation areas. Allow foliage to die back naturally before mowing lawns. In zones 8a–8b, plant in December with pre-chilled corms for best results.

Crocus in Other States

Frequently Asked Questions

When should I plant Crocus in Oregon?

Planting dates for Crocus in Oregon depend on your USDA zone. Oregon spans zones 6a, 6b, 7a, 7b, 8a, 8b. Check the planting calendar above for your specific zone's frost dates and planting windows.

What zone is Oregon for planting?

Oregon contains USDA hardiness zones 6a, 6b, 7a, 7b, 8a, 8b. Your specific zone depends on your location within the state — northern and higher-elevation areas are in colder zones, while southern and coastal areas are warmer.

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