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A 360-degree photo from Lassen Volcanic National Park at Sulphur Works hydrothermal area. (31428dd7-35bf-4af0-ae79-355f86b49464)📷 Amanda Sweeney, Public domain

Sulphur Works

Lassen Volcanic National Park, CA

Nature

Bubbling mud pots and steam vents right beside the park highway near the southwest entrance. It is the easiest hydrothermal stop in Lassen and stays accessible longer in the season than the higher trails.

Nearest town
Lassen Volcanic National Park, CA
Category
Nature & parks
GPS
40.4485, -121.5347

Hours, fees and access change. Confirm with the operator or park before you go.

Good to know

Best time to go

JanFebMarAprMayJunJulAugSepOctNovDec

The most pleasant months are usually May–September. Still fine, with some compromises, in April and October. (Estimate from long-term temperature averages, terrain and pass seasons)

Featured in these trip guides

Lassen Volcanic loop: Burney Falls to the mud pots – Burney Falls HDR photograph, McArthur–Burney Falls Memorial State Park, California© JonMallard10 · CC BY 4.0
89
National park loops

Lassen Volcanic loop: Burney Falls to the mud pots

136 mi7 stops3 days

Nearby

360 Bumpass Hell Overlook (52d27a8b-0ceb-453b-a6b8-be2263c24ee6)© Amanda Sweeney · Public domain
Editor's pick
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Bumpass Hell

Lassen Volcanic National Park, CA
Manzanita Lake – Loomis Museum Seismographic Building© DimiTalen · CC BY-SA 3.0
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Manzanita Lake

Lassen Volcanic National Park, CA
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Subway Cave

Old Station, CA
McArthur-Burney Falls Memorial State Park – Burney Falls HDR photograph, McArthur–Burney Falls Memorial State Park, California© JonMallard10 · CC BY 4.0
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McArthur-Burney Falls Memorial State Park

Burney, CA

Campsites nearby

All campsites in California · Campsite data: © OpenStreetMap contributors, ODbL 1.0 · Updated October 3, 2026

FAQs

Where is Sulphur Works?

Sulphur Works is in Lassen Volcanic National Park, CA, at GPS 40.4485, -121.5347. It is about 19 mi from Chester.

Can you camp near Sulphur Works?

Yes. The nearest campsite listed in OpenStreetMap is Southwest Campground, about 1 mi away; within 25 mi there are 44 campsites and motorhome stopovers.

Which road trips pass Sulphur Works?

Sulphur Works is a stop on these CampingSpirit trip guides: Lassen Volcanic loop: Burney Falls to the mud pots.

What is there to see near Sulphur Works?

Places worth a stop nearby: Bumpass Hell (2 mi), Manzanita Lake (6 mi), Subway Cave (17 mi) and McArthur-Burney Falls Memorial State Park (39 mi).

When is the best time to visit Sulphur Works?

The most pleasant months are usually May–September. Still fine, with some compromises, in April and October. (Estimate from long-term temperature averages, terrain and pass seasons)