Newsom Springs delivers 99-degree water at just 638 feet elevation in the coastal ranges, creating a remarkable 39-degree temperature differential in this Mediterranean climate zone. The modest walk from the road makes thermal waters easily accessible to visitors.
The spring sits along Newsom Springs Road with coastal oak woodland and grassland dominating the landscape. The 350-foot approach crosses exposed chaparral terrain in this transitional zone between the coast and inland valleys.
History of Newsom Springs
Newsom Springs represents geothermal activity in San Luis Obispo County's coastal mountain system. The thermal feature relates to deeper geological processes in California's Coast Ranges, a region known for scattered thermal and mineral springs.
Access via a short walk from Newsom Springs Road provides easy day-visit opportunity. The low elevation means mild temperatures year-round, with virtually no snow and moderate annual precipitation of 14 inches making visits feasible any season.
Is Newsom Springs worth visiting?
Best for
- Warm-water soaking
- Overnight camping trips
Newsom Springs is well suited for warm-water soaking and overnight camping trips.
Annual Precip: 14.0 in
Annual Snow: 0.0 in
January
Air 53°F · Water 99°F · +46° contrast
February
Air 53°F · Water 99°F · +46° contrast
December
Air 53°F · Water 99°F · +46° contrast
January offers 14°F more contrast than September
Overview
American Canyon is a small, secluded campground which borders the Machesna Wilderness. While the campground is accessible through the wilderness, it is a long and strenuous hike as vehicles are not permitted in wilderness areas. The only motorized entrance is through the Avenales Ranch. This is a working cattle ranch, and the owners have been generous to grant access to American Canyon through their ranch. Entrance via the ranch gate is opened only during deer hunting season, by rese...
Reserve on Recreation.gov →
Swimsuit & towel
Water bottle
Stay hydrated, especially in hot water
Camping gear
Nearby camping at American Canyon Campground
Trash bag
Pack out what you pack in
0 miles from Arroyo Grande, CA
USGS Quad: OCEANO 7.5 · PP 492: 100.0 · NOAA: 7.0 · AMS Map: SAN LUIS OBISPO
What is the water temperature at Newsom Springs?
Newsom Springs has a water temperature of 99°F (37°C). This is a warm thermal spring.
Where is Newsom Springs located?
Newsom Springs is located in San Luis Obispo County, California at 638 feet elevation, near Arroyo Grande. Coordinates: 35.1220°N, 120.5420°W.
How do I get to Newsom Springs?
Newsom Springs has Short Walk road access, with the nearest road being Newsom Springs Road (351 ft from the road).
Can I camp near Newsom Springs?
Yes, American Canyon Campground is located nearby (17.0 miles away).
Is it safe to soak at Newsom Springs?
Newsom Springs is generally safe for soaking at its recorded temperature. Access may be on private land or unconfirmed — verify current conditions before visiting. Always tell someone your plans before visiting remote hot springs.
Is Newsom Springs crowded?
Newsom Springs sees varying levels of visitors depending on the season and day of the week.
What should I bring to Newsom Springs?
Essentials for Newsom Springs: swimsuit, towel, water bottle, camping gear, a trash bag to pack out what you pack in.