Thunder Spring and Chimney Flats Loop
Thunder Spring and Chimney Flats Loop
4.8
(4268)
11,918
hikers
Thunder Spring and Chimney Flats Loop
01:54
6.35km
210m
Hiking
Begin your journey at the serene Doane Pond, which marks the start of the Thunder Spring and Chimney Flats Loop. This easy hike covers 3.9 miles (6.4 km) and involves a gentle elevation gain of 694 feet (211 metres), making it a comfortable outing that typically takes about 1 hour…
Last updated: April 23, 2026
Waypoints
Start point
Get Directions
4.52 km
Scott's Cabin
Ruins
4.92 km
Palomar Mountain State Park
Nature Reserve
6.20 km
Doane Pond
Highlight • Lake
Tip by
6.35 km
End point
Parking
Way Types & Surfaces
Way Types
6.32 km
< 100 m
Surfaces
3.97 km
2.35 km
< 100 m
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Elevation
Highest point (1,630 m)
Lowest point (1,420 m)
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Weather
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Today
Tuesday 19 May
24°C
11°C
0 %
Additional weather tips
Max wind speed: 12.0 km/h
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This route was planned by komoot.
Frequently Asked Questions
How long does it take to hike this loop?
The Thunder Spring and Chimney Flats Loop is approximately 6.35 kilometers (3.95 miles) long. Komoot estimates the average hiking time to be around 1 hour and 54 minutes, though this can vary based on your pace and how often you stop to enjoy the scenery.
What is the difficulty level of this trail?
Komoot rates this trail as easy, however, many hikers consider it moderately challenging due to some steep sections, particularly the climb up Chimney Flats. It involves an elevation gain of about 211 meters (694 feet). Trekking poles can be helpful for these parts.
Where does the trail start and where can I park?
The loop often begins near Doane Pond within Palomar Mountain State Park. The park offers well-maintained facilities, including parking areas and restrooms, making it easy to access the trailhead.
Is this trail dog-friendly?
No, dogs are not permitted on the trails within Palomar Mountain State Park, including the Thunder Spring and Chimney Flats Loop.
Do I need a permit or is there an entrance fee for Palomar Mountain State Park?
Yes, Palomar Mountain State Park typically requires an entrance fee per vehicle. You do not need a separate hiking permit for the trails themselves, but you should be prepared to pay the park entrance fee upon arrival.
What is the best time of year to hike this route?
The trail offers beauty year-round. May and June are ideal for seeing the rare Western Azaleas in bloom. Fall brings vibrant colors from black oaks, yellow ferns, and red poison-oak. Early mornings are best for spotting wildlife like deer and wild turkeys.
What kind of terrain can I expect on the loop?
The terrain is diverse, ranging from broad paths around Doane Pond to winding paths through the Upper Doane Valley. You'll cross Chimney Creek multiple times and navigate through forests of cedar, oak, fir, and pine. Some sections can be steep, and you might encounter dirt road portions or overgrown areas.
What natural features and landmarks can I see along the way?
You'll experience extensive forests, a trickling stream, and a canopy of azaleas. Notable features include a 100-year-old apple orchard, an old grave site, and the historical Scott's Cabin site. The trail offers some of the best views in Palomar Mountain State Park, with a distinct 'mountains' feel.
Does this trail intersect with other paths?
Yes, this loop combines sections of several official trails within Palomar Mountain State Park. You will hike parts of the Chimney Flats Trail, Thunder Spring Trail, Cedar Trail, Scott's Cabin Trail, and the Upper Doane Valley Trail.
What wildlife might I encounter on the trail?
Early mornings are excellent for spotting deer and wild turkeys. While less common, there's a possibility of seeing bobcats, mountain lions, coyotes, and gray foxes. The diverse forest environment supports a variety of local fauna.