Herbert Glacier Trail: the DIY Glacier Walk at Mile 28

The Forest Service's trail page gives the frame: the Herbert Glacier Trail is 4.9 miles long, begins at Glacier Highway mile 28 and ends at Herbert Glacier, and was rebuilt around 2003. The first 3.5 miles or so carry a 6-foot-wide gravel tread that the agency calls excellent for an easy mountain bike ride, after which the trail becomes more technical for bikes, though it is possible to walk bikes beyond the tricky spots. The page lists hiking and mountain biking as the only uses, notes there is no water available on site, and points visitors to the postglacial plant succession the trail passes through, from glacially deposited mounds toward a terminal moraine.

• Miles 0 to 3.5: wide gravel tread through mature hemlock and spruce, described by the Silverbow Inn's guide as fairly wide and mostly flat, and by the agency as bike-friendly
• The middle miles pass kettle ponds, the mirror ponds the Adventure Flow description names, with ducks, kingfishers, beavers and the occasional river otter
• The trail pinches between cliff and river before gaining the outwash plain, the section Adventure Flow calls its favourite part
• The end: a braided stream and gravel bar under the glacier, where alaska.org's description has you look up at the ice

The succession story the trail tells

Alaska.org's description makes the ecological point that turns a long walk into a lesson: as glaciers retreat, plants move in to occupy the exposed land, and this entire trail is a classic example of that succession, from mature forest to scrub trees to rocky moraines as you approach the ice. The Forest Service frames it the same way, directing hikers to study postglacial plant succession along the route. Practically, that means the walk gets younger and barer as it goes, and the scenery shift is the reward that makes the flat middle miles earn their keep.

How long it takes

The Forest Service publishes no hiking time. The third-party figures cluster: AllTrails carries the round trip at about four to four and a half hours, alaska.org says about five hours round trip, and the Silverbow Inn's guide expects about five. Our door-to-door routing from downtown adds the drive to mile 28 and the car-free reality: five to six hours all in, and a hard stop at the outwash edge turns it into a three-and-a-half-hour day that still delivers the glacier view.

Nobody official publishes a figure, so pick the slowest member of your group and add an hour.

The trailhead sits at mile 28 of Glacier Highway just past the Herbert River Bridge, with a lot for approximately 14 cars on the right side of the highway, per the Forest Service page. The Silverbow Inn's guide adds the local knowledge that the trail is not well marked but is easy to find, recommends an early start because there are only 15 parking spots and no overflow parking nearby, and nothing official disputes the arithmetic. From downtown, mile 28 is the far end of the road system, past Auke Bay and the shrine of St. Therese turnoff country, a drive of roughly 35 to 40 minutes, our estimate.

No Capital Transit route reaches it; this is rental-car, taxi or tour-vehicle territory, and the getting around page explains the road system's logic in full.

• Rental car: the practical version, and it chains with the northern sights in one day; summer availability is scarce, so book before the ship docks
• Taxi: workable, but agree a pickup time for the return, because mile 28 has no taxi rank and no phone signal worth planning around
• No bus: the transit network ends well south of the trailhead, and no official source suggests otherwise
• By bike from town: a serious road ride on top of the trail; Adventure Flow's bikers ride the trail itself and the road miles are on top of that

The 2026 trail project the Forest Service dropped

The Juneau Empire reported in February 2026 that the Forest Service dropped plans for a Herbert Glacier public-use cabin and instead proposed a trail reroute and scenic overlook. The practical consequence for a 2026 walker is that the trail you will walk is the rebuilt 2003 alignment, and the overlook proposal is exactly that, a proposal. If a new facility appears, it will show on the agency's own trail page first, and this page's figures will re-date when it does.

The Forest Service's warning is categorical: under no circumstances should you approach the face of the glacier because of the danger of falling ice. The trail ends at the outwash plain, a braided stream and gravel bar under the glacier, and alaska.org's description is blunt that you should not approach the face. Adventure Flow's local description adds the access detail behind the warning: no path exists to get across the river closer to the glacier, and the scrambles and bushwhacking routes onto the ice are exactly that, unmarked and risky, with ice bridges forming only in winter, an easier and riskier crossing.

The product of the trail is the view from the plain; everything beyond it is where the accidents live.

• Glacier face: do not approach, per the USFS; falling ice is the stated reason
• The river: braided, cold and glacial; the far side may look closer on a low-water day, and no official source rates any crossing as safe
• Bugs in July: the local descriptions name the salmonberry and devil's club corridors; head net and repellent in June and July is the standard local kit, ours and the guidebooks' advice, not an agency rule
• Bears: this is Tongass bear country from the parking lot onward; the safety and wildlife page carries the protocol, and the USFS page names mountain goats on the surrounding cliffs as the likelier sighting at the head of the valley

What to carry, and what nobody publishes

The USFS page states there is no water available at the trailhead, so carry your own; beyond that the agency publishes no packing list, and no official source prints a weather rule, a closure threshold or a river gauge for the crossing. The honest defaults for a Southeast Alaska valley walk, layers, waterproofs, food and the 230-precipitation-days expectation the weather page quantifies, are the practical answer to a condition set nobody official documents. The trail's own rebuild, around 2003, is the newest facility fact on record, and the toilet at the trailhead is the only one.

Mendenhall is the road-accessible glacier: a visitor center, a $5 day pass from 1 May to 30 September, boardwalks to Nugget Falls and the iceberg lake, all documented on the site's Mendenhall page. Herbert is the walk-in version: free, five hours longer, no buildings, and a glacier face you see from its outwash plain rather than across a lake. The Herbert face fills more of the view and no viewing platform mediates it; the cost is the mileage and the logistics.

Cruise-day arithmetic settles most cases: if the port gives you less than six hours ashore, Mendenhall or a flight wins; if you have a full day and the legs, Herbert is the walk that earns the word wilderness.

And the helicopter question

The PAA about the easiest glacier to walk on in Alaska usually wants the honest answer for a cruise visitor: the easiest glacier to stand on is the one a helicopter or a guided canoe delivers you to, because the walking versions end at viewpoints rather than on ice. Herbert gets you closest by foot for free; the helicopter glacier tours put boots on the ice in half a day, and the Mendenhall ice trek is the middle path. Matanuska, the other PAA name, is a different Alaska entirely, a highway glacier near Anchorage, and not a Juneau option.

• The Forest Service gives the trail length as 4.9 miles one way, which resolves a blog argument between the 9.8-mile AllTrails figure and the 9.1-mile Adventure Flow one: those are round trips, the agency prints one way. (fs.usda.gov Tongass trail page,.)
• The first 3.5 miles carry a 6-foot gravel tread the agency calls excellent for an easy mountain bike ride, and biking is one of only two uses the trail allows. (fs.usda.gov trail page.)
• The trail was rebuilt around 2003, which is why the tread reads newer than the 1930s-era trails closer to town. (fs.usda.gov trail page.)
• The Forest Service dropped its plan for a public-use cabin on the glacier in 2026 and proposed a trail reroute and scenic overlook instead, so the facility list is in motion. (Juneau Empire, 5 February 2026.)
• The kettle ponds in the middle miles hold ducks, kingfishers, frogs, beavers and the occasional river otter, which is the wildlife reward most day-hikers walk past at touring pace. (Adventure Flow trail description.)

On a cruise day the Herbert Trail is a commitment that only works with an early ship arrival and a late all-aboard, and the honest port-day advice is the Mendenhall page instead. On a multi-day visit it is the wilderness anchor: the north road day pairs the trail with the shrine on the way home, and the free things to do page counts it as the biggest free thing in Juneau. Rainy weeks change the calculation rather than cancelling it, and the rain and what to do page carries the indoor substitution set.

• Full free day: the trail out and back, the shrine on the drive home, and the free things to do budget untouched.
• Ice day: the Herbert walk in the morning legs or the helicopter landing if the port day is short.
• Local pace: bike the gravel miles, walk the technical end, and the kettle ponds get the time they deserve.
• Still deciding: the glaciers hub ranks every ice option by time and money, and the things to do hub ranks the rest of the city.