🦇 California Caving & Spelunking Brief 8/31/26

The biggest issues for California cavers this week are active cave closures, white-nose syndrome precautions, very high fire danger, and major wildfire closures around Big Sur/Los Padres National Forest.

🔴 1. Lava Beds: multiple caves currently closed

Lava Beds National Monument currently lists several caves as closed. The latest NPS caving page includes Balcony Cave, Blue Grotto, Natural Bridge, Ovis Cave, Paradise Alleys, Thunderbolt and Hopkins Chocolate among the closures. Closures can be temporary, seasonal, safety-related, or for wildlife protection.

Importantly, a free caving permit is required before entering caves at Lava Beds. Visitors undergo white-nose syndrome screening, and equipment that may have been contaminated can be prohibited unless properly decontaminated.

Practical impact: Grotto trips should verify the individual cave immediately before departure rather than assuming that a normally accessible lava tube is open.

Lava Beds current cave conditions

🦇 2. White-nose syndrome remains a major California concern

This is probably the most important continuing cave-conservation issue for California grotto members.

California wildlife officials warn that people can potentially transport the fungus associated with white-nose syndrome (WNS) on clothing and equipment used in caves, mines and bat roosts. CDFW strongly urges decontamination of equipment and clothing after cave or mine visits and recommends avoiding unnecessary entry into bat roosts.

Lava Beds has consequently maintained its screening and cave-permit system. Gear previously used in other caves or mines can require decontamination before being allowed underground.

This matters to prospectors too. Old mines and adits can be bat habitat, so prospecting equipment, boots and clothing used underground should be treated with the same biosecurity awareness as conventional caving equipment.

🟡 3. Pinnacles: Bear Gulch currently CLOSED

At Pinnacles National Park, the current NPS cave-status page reports:

Bear Gulch Lower Cave — CLOSED, Bear Gulch Upper Cave — CLOSED, Balconies Cave — OPEN

Bear Gulch closures are closely tied to protection of Townsend's big-eared bats. Cave status can also change because of flooding, rockfall, vandalism or other emergencies.

The park currently lists its overall fire danger as VERY HIGH, with restrictions including no wood fires or charcoal grills and no smoking on trails.

Practical impact: Don't plan a Pinnacles grotto outing from the normal seasonal calendar alone. Check the live cave-status page shortly before leaving.

Pinnacles current cave status

🔴 4. Big Sur / Los Padres — major wildfire caution

This is the highest-priority outdoor caution this week.

The Plaskett Fire began August 26 in Monterey County on USFS-managed Los Padres National Forest. An August 30 official update reported approximately 8,241 acres and just 1% containment, with multiple evacuation orders and warnings.

Highway 1 has also been closed through a substantial section of the Big Sur coast because of the Timber and Plaskett fires.

California State Parks has separately closed Point Sur State Historic Park, Andrew Molera State Park, Pfeiffer Big Sur State Park and Julia Pfeiffer Burns State Park because of the Timber Fire.

Recommendation for cavers: Treat the affected Big Sur/Los Padres backcountry as a NO-GO area wherever an evacuation or land closure is in effect. Even outside the closure perimeter, smoke, rapidly changing fire behavior, emergency traffic and road closures can make remote cave trips particularly risky.

Official CAL FIRE Plaskett Fire updates

🔥 5. Fire restrictions extend well beyond Big Sur

BLM California has extensive fire restrictions in effect across public lands. Some restrictions include limits on smoking and use of internal-combustion equipment off established roads or trails, depending on the field office.

At Lava Beds, conditions have become serious enough that an NPS closure order effective July 31, 2026 prohibits campfires and other open-flame devices throughout the monument. Gas or pressurized stoves with immediate shutoff valves remain permitted.

This matters for grotto expeditions because the hazard isn't necessarily underground—the greater risk can be getting trapped between the cave and the highway by a fast-moving wildfire or road closure.

🟢 6. Crystal Cave is OPEN for the 2026 season

There is good news at Crystal Cave.

NPS reports that Crystal Cave is open for guided tours during the 2026 season. There is construction on Crystal Cave Road during part of the summer, so additional travel time may be necessary.

The NPS also specifically warns visitors about white-nose syndrome and notes that the disease has now been detected in California.

🟢 7. Mitchell Caverns reopening after summer closure

Providence Mountains State Recreation Area is finishing its normal July–August seasonal closure today, August 31.

The park operates September through June, generally Friday through Sunday and holiday Mondays. For September, the state currently lists 10:00 a.m. Mitchell Caverns tours on operating days. The tour includes roughly a 1.5-mile round-trip hike and approximately two hours underground.

This makes Mitchell Caverns one to watch beginning in September.

⚠️ Weather issue to remember: caves + thunderstorms

Although fire is the dominant concern right now, California cavers should continue treating flash flooding as an automatic cave-trip reconsideration trigger.

Pinnacles specifically notes that its talus caves can close because of high water during and after storms.  This principle should be applied much more broadly: rain does not have to fall directly over a cave entrance for upstream runoff to create dangerous underground conditions.

Burn scars make this especially important. Heavy rainfall over recently burned terrain can produce rapid runoff, debris flows and blocked access roads.