Fall foliage near Merced is building this week, not yet at peak: black oaks, bigleaf maples, and dogwoods are turning along the Merced River in Yosemite Valley, sandhill cranes are arriving at Merced National Wildlife Refuge, and fall-run Chinook salmon are moving up the Merced River below McSwain Dam. The best viewing this week is the Merced River corridor in Yosemite Valley, the refuge's free 5-mile auto tour, and the Merced River Hatchery near Snelling.
This is the second weekly Seasonal Nature Report for Merced County and the nearby Sierra foothills, published every week through the fall color and spring bloom seasons. Each report covers what is happening in nature right now, where to see it best, and honest notes on what has not started yet. Mid-October is when the Central Valley show picks up: cranes building on the wetlands, salmon pushing up the rivers, and the first touches of gold spreading down the foothills. For more ways to enjoy the week close to home, see the weekend guide for October 16-18, and catch up on last week's nature report for the week of October 6 for the season's full arc so far.
Where Is the Best Fall Foliage Near Merced Right Now?
Fall color in the Sierra marches downhill through October, and this week the main show is in Yosemite Valley at about 4,000 feet. Black oaks are turning golden-orange, bigleaf maples glow bright yellow, and dogwoods are starting to blush red and pink along the Merced River. The National Park Service notes fall color is usually at its height in late October, and the California Fall Color report pegs most of the state peaking from October 15 to November 1, with Mariposa County the last county to peak, around November 8. In other words: the color is here, and the best weeks are just ahead. The foothills closest to Merced peak later still, in late October through mid-November.
This week: the Merced River corridor in Yosemite Valley
The classic viewing loop is the Merced River corridor from Sentinel Bridge to Cook's Meadow, where the river reflects the turning trees against the valley walls. Cathedral Beach and El Capitan Meadow along Southside Drive are favorite stops for oaks and maples framing the big granite faces, and Tunnel View gives the wide postcard view of the whole valley in color. The National Park Service fall color page tracks the season week by week. Weekday mornings are the quietest time to visit, and the valley is about a 1.5 to 2 hour drive from Merced via Highway 140.
Closer to home: the Highway 140 foothills are just starting
The nearest fall color to Merced is along the Highway 140 corridor from Mariposa through Midpines toward El Portal, at 2,000 to 3,000 feet. This week the western redbuds are showing gold and crimson, and the willows and cottonwoods along the Merced River are just beginning to color, with the black oaks on the hillsides following later. The corridor typically peaks in late October through mid-November, so it is a scenic drive any week of the fall and the natural gateway into Yosemite from the valley. The oak-dotted hills around McSwain and Lake McSwain follow the same late-October rhythm, and the historic town of Mariposa makes a good lunch stop along the way.
Bird Migration Watch: Sandhill Cranes Are Building at Merced National Wildlife Refuge
Sandhill cranes are abundant on Merced National Wildlife Refuge from September through March, and this week marks the start of the big autumn build: the first lesser sandhill cranes have arrived, and numbers climb steadily through November, with the largest concentrations from mid-December through late February. Migratory ducks and geese are arriving too, and the refuge's seasonal wetlands fill with birds through the fall.
The best place to see them is the refuge's free 5-mile auto tour route, entered at 7430 West Sandy Mush Road, Merced, CA 95341, about 15 miles southwest of Merced off State Highway 59. The one-way gravel route is open year-round, free, and runs from half an hour before sunrise to half an hour after sunset daily. Two elevated observation platforms, one at the entrance parking lot and a second about halfway along the route, give the best views over the seasonal marshes. Early morning and late afternoon are the prime times, when cranes fly between roosting and feeding areas. Stay in your vehicle on the tour route, and bring binoculars.
One honest note for birders: the Beckwith wildlife observation area at San Joaquin River National Wildlife Refuge, the favorite spot for cranes and Aleutian cackling geese, opens seasonally from mid-October through mid-March. No exact opening date has been published for this year yet, so check the refuge's page before planning that visit. For the full lowdown on the Merced refuge, see the Trail or Park of the Week feature on Merced National Wildlife Refuge.
Salmon Run: Fall-Run Chinook Are Moving Up the Merced River
October is the peak month for the Merced River's fall-run Chinook salmon run, and this week is a great time to see it. The California Department of Fish and Wildlife surveys returning adult salmon each fall, and the Merced Irrigation District releases special pulse flows in October to help migrating fish move up the river below New Exchequer and McSwain dams. The upstream limit of the run is Crocker-Huffman Dam, and the best public viewing is right below it.
The prime spot is the Merced River Hatchery at 4998 Robinson Road, Snelling, about 20 miles east of Merced, where the CDFW hatchery page describes the fish ladder that opens around October 1. The hatchery is open to the public from 8 a.m. to 3 p.m. (a rough gravel road leads in), and the ladder and holding ponds give close, safe views of spawning fish. Salmon can also be watched in the river below McSwain Dam near the Merced Falls Reservoir, with a large parking area and fishing access at the base of the dam. Use extra caution near the river during October pulse-flow releases, when flows rise on short notice.
First Snow Watch: The Sierra's October Window
October is the month when the Sierra Nevada typically receives its first significant snow of the season, but as of this writing no major snowfall has been confirmed in the high country this week. The window is open, and a storm could change the picture at any time. Tioga Road is currently open (expect delays in Tuolumne Meadows on weekdays), and Glacier Point Road reopened on October 10 after being closed for fire operations. Both roads normally stay open until the first significant permanent snow, which usually arrives in November, and neither is plowed once it closes for the season. Note that overnight parking along both roads is prohibited starting October 15, and a few trails near Wawona remain closed from the Dome Fire, so check the park's current conditions page before heading up.
Not Yet: What Hasn't Started This Week
A few seasonal phenomena are still ahead of us, and it helps to know the timing so you do not plan a trip around the wrong week:
- Peak valley floor color: Yosemite Valley's dogwoods, black oaks, and bigleaf maples reach their height in late October into early November, so the richest color is still a week or two away.
- Foothill oak color: Highway 140 and the Mariposa foothills peak in late October through mid-November, later than the valley.
- Monarch butterflies: Only a slow trickle of monarchs has reached California coastal groves so far. Peak populations arrive from late November through February at sites like Natural Bridges State Beach and the Pacific Grove Monarch Sanctuary.
- First snow: No significant snowfall has been confirmed in the high country this week, but October is the typical arrival window.
- Spring blooms: Wildflower and blossom season returns in March through May. The Seasonal Nature Report will cover it then.
Enjoy the season, Merced. The cranes are building on the wetlands, the salmon are running in the river, and the valley is turning gold. And when you are ready to talk about your home, Monica is here, whether you are selling now or planning for the new year. Learn more about Monica's approach on her about page, and find the whole archive of guides on the blog.
Frequently Asked Questions About Nature Near Merced This Week
Where is the best fall color near Merced right now?
This week the best fall color is along the Merced River corridor in Yosemite Valley, where black oaks turn golden-orange, bigleaf maples glow yellow, and dogwoods blush red and pink. Favorite stops include Sentinel Bridge, Cook's Meadow, Cathedral Beach, El Capitan Meadow, and Tunnel View. The Highway 140 foothills near Mariposa are showing early color from redbuds and cottonwoods but typically peak later, in late October through mid-November.
Are sandhill cranes at Merced National Wildlife Refuge yet?
Yes. Sandhill cranes are abundant on the refuge from September through March, with numbers building through November and the largest concentrations from mid-December through late February. The free 5-mile auto tour at 7430 West Sandy Mush Road is open year-round from half an hour before sunrise to half an hour after sunset, with two elevated observation platforms.
Where can I see salmon spawning on the Merced River?
The Merced River Hatchery at 4998 Robinson Road, Snelling, sits just below Crocker-Huffman Dam, the upstream limit of the fall-run Chinook run. Its fish ladder opens around October 1, and the hatchery is open to the public from 8 a.m. to 3 p.m. Salmon can also be watched in the river below McSwain Dam. Use caution near the river during October pulse-flow releases.
Has it snowed in the Sierra yet?
No significant snowfall has been confirmed in the high country this season as of this week. Tioga Road and Glacier Point Road are both open, though overnight parking along both roads is prohibited starting October 15. Both roads normally stay open until the first significant permanent snow, which usually arrives in November.
When do monarch butterflies arrive in California?
Monarchs begin arriving at coastal overwintering groves in a slow trickle in mid-October, with numbers building through November and peak populations from late November through February. Natural Bridges State Beach in Santa Cruz and the Pacific Grove Monarch Sanctuary are two well-known public viewing sites.
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