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Pacific trillium in Oregon

Trillium ovatum · peak April in Oregon

Pacific trillium in Oregon
(c) Drew T Henderson, some rights reserved (CC BY-NC), uploaded by Drew T Henderson · CC BY-NC · via iNaturalist

Based on 3,133 research-grade iNaturalist flowering observations in Oregon, Pacific trillium blooms mainly from March to May, peaking in April. It ranks #1 among wildflowers recorded in the state in our data.

Trillium ovatum

Pacific trillium in Oregon by month

JanFebMarAprMayJunJulAugSepOctNovDec

Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.

Also in bloom in Oregon in April

Small Camas
Small CamasCamassia quamash
Pacific Bleeding Heart
Pacific Bleeding HeartDicentra formosa
Giant White Fawn Lily
Giant White Fawn LilyErythronium oregonum
Giant White Wakerobin
Giant White WakerobinTrillium albidum
Checker Lily
Checker LilyFritillaria affinis
Stream Violet
Stream VioletViola glabella
Lawn daisy
Lawn daisyBellis perennis
Nuttall's toothwort
Nuttall's toothwortCardamine nuttallii

Places to look in Oregon

Willamette National ForestNational Forest
Willamette National ForestLane County
Mount Hood National ForestNational Forest
Mount Hood National ForestClackamas County
Deschutes National ForestNational Forest
Deschutes National ForestDeschutes County
Hoyt ArboretumBotanical Garden
Hoyt ArboretumMultnomah County
Leach Botanical GardenBotanical Garden
Leach Botanical GardenMultnomah County
Umatilla National ForestNational Forest
Umatilla National ForestUmatilla County

FAQ

When does Pacific trillium bloom in Oregon?
Mainly March–May, with the most records in April.
How common is Pacific trillium in Oregon?
It ranks #1 by number of iNaturalist flowering observations among wildflowers in Oregon (3,133 records in our sample).