The Hidden Lake Trail, along with the lookout, is located, entirely, within Mt. Baker-Snoqualmie National Forest. Hidden Lake, however, and anything past the final ridge saddle is located within North Cascades National Park.
The trail to Hidden Lake is famous for its diversity and scenic vistas which provide uninhibited views of the Cascade mountain range, extending from British Columbia through Washington and Oregon into northern California. The namesake lake on this hike is found near the summit, where its crystal, blue waters seemingly disappear into an abyss, backdropped by some of the more notable peaks within the region.
While the hike itself is a worthy feature, it’s the Hidden Lake Lookout that adds a unique historical element to this terrain (and some amazing photo opportunities). It gives visitors a glimpse into the life of a forest service fire tower, a popular method of forest protection used in the Cascades many years ago.
The lookout was originally built in 1932, however, it was decommissioned from Forest Service use in 1953. For much of the next 25 years, it was utilized by the Skagit Alpine Club before coming under the care of one of the club’s former members, Fred Darvill. Dr. Darvill was determined to preserve the lookout for historical significance and the enjoyment of future hikers.
The allure of a place that contains, both, a stunning visual and a historical remnant was confirmed when Hidden Lake Lookout was placed on the National Register of Historic Places in 1987.
Type of Trail
Hikers can choose to experience the Hidden Valley Lookout on a strenuous out and back day-hike or choose to spend a night in the lookout shelter on an overnight backpacking trip. Here are the main features of the trail:
- 4.5 miles to Hidden Lake Lookout (9 miles round trip)
- 2,900 feet of elevation gain
- Trail designated for hiking only
- Pets (controlled and on a leash) are allowed on the trail and at the lookout but NOT within the national park boundary
- Sections of snow likely even in summer
Planning Your Hike
Best time to hike Hidden Lake Lookout
It is true that people make their way to the lookout throughout the year, although, only hikes taking place in late summer or early fall are suitable for those who don’t have specialized equipment or mountaineering skills.
Early summer hikes to Hidden Lake Lookout can require route finding skills through sections of snow or even an ice ax to successfully reach the summit lookout. The sweet spot for pleasant temperatures and minimal snow coverage on the trail, most years, is early August through mid-September.
There are no special permits required for day hikers visiting Hidden Lake Lookout. The lookout itself, which contains a two-person mattress, is a first-come, first-serve shelter that, also, requires no permit for overnight stays, since it lies outside of national park boundaries.
Permit tip for overnight stays near the lookout: If you arrive at the fire tower and discover it is already taken, be prepared (with a tent and other gear) to descend, via a steep boulder scramble, to the only other suitable campsite locations between the saddle and the lake. Be aware that this will now be within Cascades National Park boundaries and, therefore, require a permit. That is why we recommend all hikers who plan to spend a night at the lookout, even though it is not required if they are successful, to obtain an NPS permit.
Directions to the Trailhead
Access to the Hidden Lake Trail begins from the small town of Marblemount, which visitors can navigate to via state route 20. Cross the Skagit River for the start of 10.2 miles along Cascade River Rd. Turn left onto National Forest Rd # 1540, where you will soon be following Sibley Creek for 4.5 miles to the small parking lot for the Hidden Lake Trail.
Starting from the small lot, the trail traverses through, rather, dense forest for the first mile, before crossing Sibley Creek. Enjoy wildflower-filled meadows and ever-increasing views throughout a series of switchbacks, gaining elevation, before crossing the creek one last time (good spot for water refill before higher elevations).
Be on the lookout for eagles, hawks, marmots and numerous birds who favor the headwaters of the creek within the subalpine environment. This is, also, a prime viewing window for locating Mount Baker to the west, an active, glaciated volcano which claims the designation as the third highest point in the state of Washington (impressive when you consider the number of surrounding peaks).
Enjoy rocky hillsides and open meadows as you make the push upwards towards the obvious pass of the Hidden Lake Peaks ridgeline. This notch, or saddle, provides hikers with their first views of Hidden Lake. Be sure to take a moment and appreciate the spectacular scene in front of you. The namesake lake, whose opposite shores create the illusion of an infinity pool falling into nothingness, will be the center of attention, with a crowd of impressive peaks (Forbidden, Boston, Sahale, Johannesburg) watching closely in the distance.
To reach the lookout, which you can clearly see from here on, continue for a half-mile up the narrow, rocky terrain. This section is the most likely to contain a solid snowpack if you are hiking in early summer. Remember to keep the fire tower remains in respectable condition, as lots of work has been done through the years in hopes of maintaining its historical, scenic allure.
Suggested Gear List
We’ve found that the gear required for a safe and enjoyable hike to Hidden Lake Lookout will vary considerably based on the season. Those who choose to explore this trail anytime from October through June will need to carry additional equipment and should be confident in basic mountaineering skills, route finding, and traveling over windswept snow. Remember, regardless of the weather or time of year, there are certain essentials that you should always have with you. Below is a sample checklist of gear we might bring for a standard day-hike to Hidden Lake Lookout during summer months.
- Map & compass
- Headlamp (yes, even if we plan to be done before dark)
- Emergency bivy
- UV water filter for water treatment
- First-aid kit
- Folding sheath knife
- *Firestarter materials
*Please note that these are for emergency use only. Fires are not permitted within North Cascades National Park
- Lightweight wind shell – great for breaks or at higher elevations (we love the Patagonia Houdini which is light & packable)
- Hiking pants – nylon and/or spandex are best
- Lightweight trail runners or hiking shoes (we also pack microspikes if we expect snow)
- Merino wool base layer and/or comfortable top – deep chest zipper adds to ventilation options & versatility
Food and Water
- Several 200-400 calorie snacks to eat throughout the day – look for foods that are suited to hiking and backpacking
- One hard-sided 1L Nalgene
- One collapsible 1L bottle
- If melting snow for water consumption, make sure to pack a capable stove
- Make sure to apply sunscreen before your hike – approximately 7 of the 9 miles are without shade
- If you are planning on overnighting then replace the bivvy with a tent, and add your sleeping system plus more food and water.
Good to Know & Additional Info
Hidden Lake Lookout is an exceptional place to take a break or capture some memorable photos, but it is, also, an ideal vantage from which to practice your map and compass reading skills. Imagining that you are a National Forest Service ranger, stationed atop the fire tower in the mid-1930’s, see if you can identify the following Cascade mountain peaks:
- Boston Peak
- Sahale Mountain
- Johannesburg Mountain
- Eldorado Peak
- Mount Baker
- Mount Forbidden
- Eldorado Peak
- Mount Baker
- Mount Forbidden
- Triad Peak
- Torment Mountain
- Klawatti Peak
On a clear, overnight stay at the lookout, consider arranging your sleeping pads on the granite slabs surrounding the tower for a once in a lifetime stargazing opportunity. Do your best to spot notable constellations or practice your astrophotography skills!
Experienced hikers, snowshoers, and mountaineers should consider a wintry exploration to Hidden Lake. What is a popular hike in summer becomes an isolating, intimidating, powerful landscape that requires challenging navigation solutions – a perfect recipe for serious adventurers!
Note: The access road is gated throughout the winter months, adding approximately 2-4 miles, each way, for prospective hikers.
Dispersed camping options
Once you reach the saddle, you are at the border of North Cascades National Park. Any camping that takes place between here and the lake will require a backcountry permit. There are numerous, dispersed camping options, however, on the backside of the ridgeline along the trail inside of the national forest. Be sure to look for established sites that impose the least impact and always practice Leave No Trace.
- Friends of Hidden Lake Lookout Facebook Page – Give a follow to the dedicated men and women who continue the preservation of the lookout. Also, stay up-to-date on their latest project plans or dates when they might be occupying the shelter.
- Free Topo Map Products from USDA Forest Service – Search for printable grids within the Mt. Baker-Snoqualmie National Forest
- North Cascades National Park Map #223
- Current NPS alerts applicable to Hidden Lake Trail users
- NPS Permits for North Cascades National Park