○ TIER 1 — SOURCED & RESEARCHED
5.5 miRound Trip
1,400 ftElev. Gain
ModerateDifficulty
2.5-4 hoursEst. Time
2,600 ftHighest Point
Out-and-BackRoute Type
YesDogs
NonePermit

Henninger Flats via Eaton Canyon

🌤 Trail Weather — Plan Your Hike Updated every 6 hrs · Trailhead coords
✅
Good Conditions — Solid Day to Hike
74°F, Clear Sky. Wind 1 mph. Standard 10 Essentials apply.
🌙
74°
Clear Sky
Feels 74°F
💨 Wind
1 mph N
Gusts to 6 mph
💧 Humidity
66%
Humid — heat feels stronger
👁 Visibility
6.2 mi
Good visibility
☁️ Cloud Cover
0%
Clear — full sun exposure
🌅 Sunrise
6:42 am
Ideal start time
🌇 Sunset
6:45 pm
Off trail by this
Today — 3-Hour Intervals
11 pm
🌥️
73°
Feels 73°
💨 0/5
5-Day Forecast
🌥️
Today
Few Clouds
73°F
feels 73°
💨 Wind/Gust
0/5 NW
💧 Humidity
62% Humid — heat feels stronger
👁 Visibility
6.2 mi — Good visibility
☁️ Clouds
16% Clear — full sun exposure
✅ Good Conditions — Go Hike
🌙
Sat, Sep 26
Clear Sky
68°F
feels 67°
💨 Wind/Gust
1/5 NNE
💧 Humidity
49% Comfortable
👁 Visibility
6.2 mi — Good visibility
☁️ Clouds
0% Clear — full sun exposure
✅ Good Conditions — Go Hike
☁️
Sun, Sep 27
Overcast Clouds
68°F
feels 66°
💨 Wind/Gust
3/9 NE
💧 Humidity
29% Dry — drink before thirsty
👁 Visibility
6.2 mi — Good visibility
☁️ Clouds
100% Overcast
✅ Good Conditions — Go Hike
☁️
Mon, Sep 28
Broken Clouds
66°F
feels 64°
💨 Wind/Gust
2/9 E
💧 Humidity
30% Comfortable
👁 Visibility
6.2 mi — Good visibility
☁️ Clouds
72% Mostly cloudy
✅ Good Conditions — Go Hike
🌙
Tue, Sep 29
Clear Sky
59°F
feels 56°
💨 Wind/Gust
4/14 N
💧 Humidity
35% Comfortable
👁 Visibility
6.2 mi — Good visibility
☁️ Clouds
0% Clear — full sun exposure
✅ Good Conditions — Go Hike
Trailhead elevation only. Conditions change at altitude. Check weather.gov before heading out. Sep 25, 8:13 pm

A wide smoothly graded fire road climb that tests steady uphill pacing. The destination is a historic mountaintop tree nursery where thousands of experimental pines and cedars overlook the entire LA Basin.

Trail Overview

Henninger Flats surprises people. You expect a viewpoint and you get an active tree nursery at 2,600 feet — rows of young pines, cedars, and native specimens being grown for reforestation projects. It is genuinely interesting. The climb is on paved fire road which means no shade on a hot day. This trail is runnable and many people use it for training. Good year-round hike because of the fire road surface.

This Hike Is For You If…

All fitness levels. Good training hike. Accessible for hikers who struggle with uneven trail surfaces. Year-round option due to low snow exposure.

Skip This Hike If…

Skip in summer after 8am. The fire road is fully exposed and the heat on the return descent is significant.

What to Expect on Trail

Terrain: Paved fire road entire route. No technical sections. Some loose gravel at edges.

Shade: Mostly Exposed

Water: None — Carry All Water. No water on trail. Water at Nature Center before you start.

Views: Good

Crowds: One of the busiest San Gabriel trailheads. Weekday mornings significantly quieter.

Dogs: Yes, dogs are welcome on this trail.

Best Arrival: Before 8am on weekends. One of the busiest trailheads in the San Gabriels.

This is a Tier 1 sourced review. Trail information is based on published sources and research. Andrew has not personally hiked this trail yet. Photos and firsthand sensory detail will be added when upgraded to Tier 2.

👞

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5.5 miRound Trip
1400 ftElev. Gain
ModerateDifficulty
2.5-4 hoursEst. Time
2600 ftHighest Point
Out-and-BackRoute Type
YesDogs
NonePermit

Trailhead & Logistics

Address: Eaton Canyon Natural Area, Altadena Drive, Pasadena, CA 91107
Parking: Free paved lot at Eaton Canyon Nature Center. No Adventure Pass required. Fills on weekends — arrive before 8am.
Bathroom: Flush Toilets
Cell Service: Good
Best Arrival: Before 8am on weekends. One of the busiest trailheads in the San Gabriels.

Trail Reality Check

Henninger Flats surprises people. You expect a viewpoint and you get an active tree nursery at 2,600 feet — rows of young pines, cedars, and native specimens being grown for reforestation projects. It is genuinely interesting. The climb is on paved fire road which means no shade on a hot day. This trail is runnable and many people use it for training. Good year-round hike because of the fire road surface.

Terrain: Paved fire road entire route. No technical sections. Some loose gravel at edges.
Shade: Mostly Exposed
Water: None — Carry All Water — No water on trail. Water at Nature Center before you start.
Views: Good
Crowds: Very Busy — One of the busiest San Gabriel trailheads. Weekday mornings significantly quieter.
Who should do this: All fitness levels. Good training hike. Accessible for hikers who struggle with uneven trail surfaces. Year-round option due to low snow exposure.
Who should skip this: Skip in summer after 8am. The fire road is fully exposed and the heat on the return descent is significant.