Calaveras Big Trees State Park closed its South Grove area on Oct. 1 for prescribed burning. The only other date on the South Grove's calendar is the winter gate on the Walter W. Smith Parkway. That gate comes down at the first significant snowfall or on Dec. 1, whichever comes first. No reopening date has been announced between those two events. For anyone in Arnold who counts the South Grove as a regular walk, this fall's South Grove season may already be over. The winter version of the park, built around the North Grove, started about a month ahead of the calendar.
The high country closed early too. Caltrans' Oct. 21 report listed State Route 4 closed for snow from 0.7 mile east of Lake Alpine to 7.2 miles west of the Highway 89 junction. October hasn't ended, and the two ends of Arnold's outdoor season are already shut. The rest of this post covers what's still open between them.
What crews are doing in the South Grove
California State Parks, working with CAL FIRE, announced in a Sept. 21 release that it planned prescribed burns on four treatment areas. Together they cover about 780 acres in the South Grove, North Grove Meadow and West Moran. The release also said closures would stay in place "until conditions favor reopening," and that smoke would linger for a while after active burning ended.
Ignition started on Oct. 19, on a 697-acre South Grove unit. This burn is partly a second pass. In October 2024, crews treated 1,145 of the 1,317 acres planned for the South Grove. This year's burn goes back over acres that didn't burn well enough to cut fuel and promote giant sequoia regeneration, and it adds new ground. State Parks explains that giant sequoias depend on moderate fire. Heat opens their cones, and fire clears the forest floor down to the mineral soil that seedlings need.
These areas are closed:
- South Grove Trail
- Beaver Creek area
- Bradley Grove Trail
- The fire road around the South Grove
- The Walter W. Smith Memorial Parkway south of the Stanislaus River
The Parkway is the key one. It's also the road the winter gate closes. Once snow arrives or the calendar reaches Dec. 1, the park shuts off vehicle access to the Stanislaus River and the South Grove regardless of how the burn has gone, and the road usually doesn't reopen until May 1 or later. Unless the burn closure lifts in the next few weeks, the South Grove goes straight from burn closure to winter closure.
Where the park's activity moves
With the South Grove out, most of Big Trees now happens at the North Grove off Highway 4. The Calaveras Big Trees Association says the North Grove stays accessible after the Parkway closes.
The next guided hike is this Saturday, Oct. 31, in the North Grove. It's the last North Grove hike on the State Parks event list for now. The next event listed after it is a Meadow Walk on June 1.
After that the park's calendar is mostly blank until late December. CBTA has scheduled this season's Warming Hall at Jack Knight Hall, where volunteers will host visitors on Dec. 23 through 31 and Jan. 1 and 2. CBTA has run Saturday guided snowshoe hikes in past winters, or a regular guided hike when there isn't enough snow. That program description was last updated in 2023, though, and no 2026–27 dates have been posted.
When snow does come, the park's winter trail map shows two routes:
| Trail | Length | Terrain, per the park map |
|---|---|---|
| North Grove Ski Trail | 1.5-mile loop | Relatively flat, winds through the giant sequoias |
| Parkway Loop Ski Trail | 3.5 miles | Moderate slopes, marked with orange signs, Sierra views |
The same map suggests that less experienced skiers ride the Parkway Loop counter-clockwise to avoid the steeper downhill section. It also says the visitor center keeps limited winter hours, posted on the building, and lists 209-795-3840 for questions. If you're thinking about an overnight stay with visiting family, State Parks says North Grove Campground has a limited number of first-come sites from November through May. The park's cabins are closed until further notice for construction.
The Rim Trail, sorted by access point
Outside the park, the Arnold Rim Trail is the main stretch of open dirt close to town. It has its own seasonal issues, and they depend on which trailhead you use. The Arnold Rim Trail Association lists four access points:
- Sierra Nevada Logging Museum, White Pines. The first mile is paved and gently graded, so it holds up best after rain.
- Cedar Center kiosk. This is the in-town option.
- Valley View Road. This is the shortest route to Cougar Rock and Top of the World. ARTA warns that its dirt section can get slick or deeply rutted after rain or snow.
- Avery Sheep Ranch Road. This is the south end, where fuel work is underway.
That last trailhead matters this fall. ARTA reported in September that fuel-reduction work is happening south of Avery-Sheep Ranch Road in San Domingo Canyon and moving north. The trail hasn't been closed, but flagged "DO NOT ENTER" segments are out, and the Sept. 4 notice put the active zone between trail posts 77 and 80. ARTA points trail users to its Trailforks conditions map for live status, since the work zone keeps moving.
So the same fuel-management work that closed the South Grove is also active on the south end of the Rim Trail, and the trailhead that works best in wet weather is the paved one in White Pines.
When the snow is deep enough to use
Once the Big Trees trails are covered, the next places to go are up Highway 4. California's official Highway 4 Sno-Park list includes three lots.
- Spicer Sno-Park, on the south side of Highway 4 at Spicer Road. Listed uses are cross-country skiing, dog sledding, snow play and snowmobiling.
- Lake Alpine Sno-Park, at the Highway 4 winter closure gate, with the same four uses.
- Round Valley Sno-Park, on Highway 207, Mount Reba Road, just north of Highway 4. Its listed use is cross-country skiing.
Lake Alpine's location means the Caltrans gate sets the edge of the winter map. With the road already closed just east of Lake Alpine as of Oct. 21, everything past that lot belongs to the snow until spring.
Sno-Park permits for 2026–27 cover Nov. 1 through May 30. They cost $15 for a day or $40 for the season and work at any Sno-Park in the state. The OHMVR Division said permits would go on sale "approximately October 2026" but didn't give a specific day. If you go up more than three days in a season, the season permit costs less.
Farther up the road, Bear Valley says the price of its 2026–27 base, Cali and College Cali passes goes up on Nov. 1. That's this Sunday, three days after this post goes up. Preferred-parking pass pickup starts Nov. 10 at Guest Services, on weekdays. The resort hasn't announced an opening day.
From now to the Warming Hall, in order
| Date | What changes |
|---|---|
| Sat., Oct. 31 | Last North Grove guided hike on the State Parks list |
| Sun., Nov. 1 | Sno-Park permit season starts. Bear Valley pass prices go up |
| Tue., Nov. 10 | Bear Valley preferred-parking pickup starts |
| First significant snow, or Tue., Dec. 1 | Walter W. Smith Parkway closes to vehicles for the winter |
| Wed., Dec. 23 | CBTA's Warming Hall opens at Jack Knight Hall |
The South Grove doesn't have a date in that table. Until State Parks posts one, the 697-acre unit off the Parkway is a place to go back to in May or later. Before then, the Parkway closes no later than Dec. 1, and the snow on Highway 4 has already started stacking up.
The weeks between the burn closure and the snow gate are also when you can still drive easily up to a cabin off Highway 4 and check how it's set up for winter before the first real storm. If you'd like someone who knows construction to walk the roof, decks and crawlspace with you, or you're thinking about what a Highway 4 cabin is worth heading into the slow season, Yana Vass can help. Schedule a free home valuation and consultation, and we'll go over it together.
