April is the blue month of the Willamette Valley camas prairies and the surge of spring migration toward the Malheur oasis. The Columbia Gorge hillsides blaze with balsamroot and lupine, songbirds pour back, and the high desert finally begins to green.
Week by week in April
April 2–8
- Malheur becomes a migrant magnet — warblers, sandhill cranes, white-faced ibis, and American avocets pour into the high-desert oasis.
- The Columbia Gorge erupts: arrowleaf balsamroot and lupine blanket hillsides yellow and blue at Rowena Crest and the Tom McCall Preserve.
- Succession-sow lettuce and peas and plant out hardened cole transplants, but hold tomatoes — the valley's last frost runs into May.
April 9–15
- Returning breeders arrive in waves — orange-crowned and Wilson's warblers, western tanagers, and black-headed grosbeaks fill the valley.
- Camas reaches its famous blue peak across the valley wet prairies, and the rare Kincaid's lupine begins in the native upland prairies.
- Asparagus arrives — crisp Columbia Basin spears — alongside spring greens, green garlic, and the first foraged morels from the Cascade foothills.
April 16–22
- The endangered Fender's blue begins to emerge in the valley's rare native prairies, tied to its host Kincaid's lupine.
- The Lyrid meteor shower peaks around April 22, radiating from near Vega rising in the northeast late at night.
- Oregon white oak finally breaks bud on the valley savanna, and Pacific dogwood opens its big white bracts in the forest.
April 23–29
- Tulip fields at Wooden Shoe and the Willamette Valley peak, and forest floors hold trillium, fawn lily, and fairy slipper orchid.
- The western meadowlark (state bird) sings from fence posts across the eastern grasslands and valley prairies.
- Harden off warm-season starts under cover; slugs are at their destructive peak with the spring rains.
Birds This Month
April launches Oregon's spring migration toward its peak. In the southeastern high desert, Malheur National Wildlife Refuge becomes a legendary migrant trap, its desert oases and Blitzen Valley filling with warblers, flycatchers, sandhill cranes, white-faced ibis, American avocets, black-necked stilts, and clouds of waterfowl — the destination for birders across the West. Greater Sage-Grouse still strut on the surrounding leks early in the month.
Across the state, returning breeders arrive in waves: orange-crowned, yellow-rumped, and Wilson's warblers, Pacific-slope flycatchers, western tanagers, black-headed grosbeaks, and vaux's swifts over the valley. The western meadowlark (the state bird) sings from fence posts in the eastern grasslands and valley prairies. On the coast, shorebird migration builds in the estuaries, and caspian terns and brown pelicans return. Rufous hummingbirds blanket the foothills.
What's Blooming
April is one of Oregon's signature wildflower months. The common camas reaches its famous peak, washing the Willamette Valley's wet prairies and oak savanna — remnants like Camassia Natural Area, Bald Hill, and Mount Pisgah — a sheet of blue that once fed Native peoples and pioneers. The rare Kincaid's lupine begins in the native upland prairies, and the state flower, Oregon grape, blooms gold throughout the forest understory.
The Columbia Gorge erupts: arrowleaf balsamroot and lupine blanket whole hillsides yellow and blue at Rowena Crest and the Tom McCall Preserve, with grass widows, desert parsley, and prairie stars. Forest floors hold trillium, fawn lily, fairy slipper orchid (calypso), and oaks toothwort. The coast's coast strawberry and headland wildflowers begin, and east of the Cascades the desert greens with sagebrush buttercup and the first bitterroot.
Garden This Month
April is peak planting in western Oregon. Succession-sow lettuce, spinach, radishes, peas, carrots, beets, and chard, plant out hardened transplants of broccoli, cabbage, kale, and onions, and set potatoes and strawberries. Sow hardy annual flowers and start dahlias. The big rule for the Willamette Valley: tomatoes, peppers, squash, and basil still wait — the average last frost runs mid-April into early May, and cold wet soil rots warm-season seed.
Harden off warm-season starts under cover, and keep cloches ready for clear cold nights. Slugs are at their destructive peak with the spring rains, so patrol nightly around tender seedlings. Mulch, weed, and side-dress overwintered crops, and thin earlier sowings. East of the Cascades, the high-desert garden is finally workable — sow the hardiest cool crops, but the Bend area can frost into June, so warm crops stay indoors a while yet.
Zone 7a (Gorge & mid-elevation): a couple of weeks behind. Direct-sow the hardy crops, plant cole transplants, and start warm crops indoors; the last frost lingers into May here.
Zone 8a (Willamette Valley): full cool-season swing — succession-sow lettuce, peas, carrots, and brassicas, and plant out hardened transplants. Hold tomatoes and peppers until after the typical mid-April-to-May frost; harden them off under cover.
Zone 8b (southwest valleys & coast): the warmest gardens approach tomato time. Plant potatoes, sow beans late month under cloche, and set out warm-season starts in the very mildest spots with frost protection ready.
What's at the Farmers Market
April markets fill with the green rush of true spring in Oregon. Asparagus arrives — the Columbia Basin and valley spears are crisp and sweet — alongside spring greens, arugula, spinach, radishes, green garlic, spring onions, and the first rhubarb. Wild foods peak: foraged nettles, fiddleheads, and prized morel mushrooms begin reaching the stalls from the Cascade foothills. Cook fiddleheads thoroughly before eating — boil 15 minutes or steam 10–12; never raw.
Markets begin reopening for the season, and vendors offer vegetable and flower starts for the home garden alongside spring bouquets of tulips and daffodils — the Wooden Shoe and Willamette Valley tulip fields are at peak. Coastal towns still land Dungeness crab and the first spring chinook. Snap asparagus the day you buy it and stand it upright in water in the fridge; use tender greens and morels quickly, refrigerating mushrooms in a paper bag. A bright, hopeful market month.
Night Sky This Month
April nights warm and the spring sky settles in over Oregon's dark-sky country. The Oregon Outback International Dark Sky Sanctuary near Lakeview, Prineville Reservoir State Park, and Pine Mountain Observatory east of Bend (which begins its public viewing season as the high desert dries) offer the state's clearest skies, and the Cascade lakes and Steens country open up as the snow recedes at lower elevations.
Overhead, Leo the lion stands high in the south, the Big Dipper rides near the zenith, and orange Arcturus climbs the east — follow the Dipper's handle arc to find it. The realm of the galaxies in Leo, Coma Berenices, and Virgo wheels overhead, a deep-sky feast in dark skies. The Lyrid meteor shower peaks around April 22, radiating from near brilliant Vega rising in the northeast late at night. The winter stars sink west after dusk. The printable Oregon night-sky guide gives this year's planet positions and the best Lyrid dates.
Butterflies & Pollinators
April brings a real surge of butterflies to western Oregon. Western tiger swallowtails sail along streamsides and through valley neighborhoods, Sara orangetips dart along sunny trails, and spring azures and the first pale swallowtails appear at woodland edges. Anise swallowtails patrol hilltops, and painted ladies and west coast ladies arrive on warm southerly flights, sometimes in numbers.
In the Willamette Valley's rare native prairies, the endangered Fender's blue begins to emerge, tied to its host the Kincaid's lupine — one of Oregon's most closely watched conservation butterflies. East of the Cascades, warming sagebrush slopes wake California tortoiseshells, juniper hairstreaks, and the first Oregon swallowtails (the state insect) in the dry river canyons. Cabbage whites and sulphurs work the gardens and field edges. Plant nectar and native host plants now to support the building broods.
Trees This Month
April is full spring leaf-out in western Oregon. Oregon white oak finally breaks bud on the valley savanna, hanging out catkins, and the bigleaf maples, vine maples, and cottonwoods flush their fresh foliage. The understory cascara, oceanspray, and red elderberry leaf out, and the woodland Pacific dogwood opens its big white bracts in the forest by month's end.
The state tree, Douglas-fir, pushes bright new growth and reddish pollen cones, and grand fir and western hemlock flush soft new needles. The Hood River and mid-Columbia pear and apple orchards bloom in waves, perfuming the Gorge. On the coast and southwest hills, the Pacific madrone readies its flower clusters. East of the Cascades, the quaking aspen shimmer with new green, the western larch needle out in soft chartreuse, and the chokecherry and serviceberry begin to bloom along the desert draws.
Weather & Daylight
Across Oregon, a typical April day averages a high near 56°F and a low near 33°F, with about 2.9 inches of precipitation — statewide averages from the 1991–2020 U.S. climate normals.
Mild and fresher, upper-50s by day with brisk mornings near freezing, and rain easing off from winter's soggy pace.
| Average high | 56°F |
|---|---|
| Average low | 33°F |
| Precipitation | 2.9 in |
| Sunrise (mid-month) | 6:25 PT |
| Sunset (mid-month) | 19:51 PT |
Figures are statewide averages over the 1991–2020 U.S. climate normals; local conditions vary with elevation and distance from the coast. Sunrise and sunset are computed for a midstate point on the 15th (PT).
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Same month elsewhere: April in Pennsylvania · April in Rhode Island · April in South Carolina