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Valley RX Burns

Unit Information

Yosemite National Park
National Park Service
P.O. Box 577
Yosemite National Park, CA 95389

NPS Shield

Incident Contact

Yosemite Fire Infoormation
Phone: (209)372-0329

Highlighted Activity

10/21/2021 Valley loop trail closure
                                    TRAIL CLOSURE – PRESCRIBED FIRE Prescribed burning will be conducted by Yosemite fire crews in Yosemite Valley starting on...
Closure - 10/21/2021
Crews add to burn piles to ensure consumption of heavy fuelsImage options: [ Full Size ]

Starting Wednesday, November 3rd, fire crews will be prescribed burning units 11 & 16 in Yosemite Valley. This is a continuation of burns conducted a week ago. Unit 11 is located south of Southside Drive near the El Capitan Crossover and Unit 16 is located between Southside Drive and the Four Mile trailhead. Ignitions will occur over the next few days. There will be trail closures in Yosemite Valley, including the Valley Loop Trail from the Four Mile trailhead to the El Captain crossover road along Southside Drive. Prescribed burn units have been carefully designed to meet multiple objectives; the objectives of this prescribed burn are to restore and maintain plant communities shaped by Native Americans, restore fire and a more natural ecosystem structure to communities, maintain meadows and healthy stands of conifers, reduce hazardous fuels, and provide protection to infrastructure. Each prescribed burn unit has defined weather parameters and firing patterns to ensure the objectives for each unit have a high potential for success. Yosemite fire and resources staff will monitor all prescribed burns to evaluate achievement of goals and help guide future prescriptions.

Visitors and employees should be aware that smoke may be present starting Wednesday and could linger to a much lesser degree into next week as large logs are consumed. Fire managers work closely with Park staff and the local air pollution control districts to time the prescribed burns to coincide with favorable weather and smoke dispersion conditions. Smoke impacts are always a consideration in the decision to begin any prescribed burning operation. Burning will only be conducted under favorable dispersal conditions as specified in the smoke permit.

Basic Information

Current as of
Incident TypePrescribed Fire
CausePrescribed Fire
Date of OriginFriday October 22nd, 2021 approx. 09:00 AM
LocationYosemite Valley south of Southside Drive between the El Capitan crossover road and Four Mile trailhead.
Incident CommanderNPS
Incident DescriptionPrescribed Fire
Coordinates37.726 latitude, -119.609 longitude

Current Situation

Total Personnel25
Size53 Acres
Percent of Perimeter Contained100%
Fuels Involved

Mixed conifer timber understory with dead an downed fuels.

Significant Events

The valley loop trail is still closed until further notice from Four Mile trailhead to El Cap crossover south of Southside Drive.



Fire crews conducted firing and burning operations today on the Valley RX burn. Heavy fuels are being consumed, along with forest litter and snags. Visitors will see smoke, fire, and firefighters along Southside drive in Yosemite Valley. Due to snags and burning logs, all Trail Closures will remain in effect until further notice.

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Valley loop trail closure Closure - 10/21/2021