Tarr Inlet

Margerie Glacier's blue face calves icebergs into the fjord. Harbor seals and kittiwakes visible from tour boat.

Natural Attraction

Natural Attraction
Tidewater Glacier0 ftRestrooms availableNo permit neededGolden-hour pick

At the head of Tarr Inlet, two tidewater glaciers dominate the view: Margerie Glacier, whose bright blue calving face actively sheds icebergs into the fjord, and Grand Pacific, now a receded shadow of its former self, heavily buried under its own debris. Harbor seals dot ice floes, and black-legged kittiwakes wheel overhead as meltwater turns the inlet a milky blue-green. The inlet itself was carved by one massive glacier that advanced all the way to Icy Strait hundreds of years ago. Named by John Muir for the main glacier, the inlet was renamed in 1911 to honor Cornell geographer Ralph Stockman Tarr, who studied its fjord in the early 20th century.

Getting there & parking

How To Get There
Fly or ferry to Gustavus, Alaska. From Gustavus, board a commercial tour boat at Bartlett Cove (9 miles south of town). Tours depart daily during peak season and take 8–10 hours round-trip to reach Tarr Inlet.
Distance From Entrance
By boat from Gustavus: approximately 30 miles (8–10 hours via commercial tour vessel)
Road Type
Marine (boat access only)
Parking Availability
N/A (marine access only); parking available at Gustavus ferry terminal
Peak Fill Times
Commercial tour capacity depends on vessel; tours operate on fixed schedules throughout peak season
GPS Coordinates
58.9763889, -136.9230556

When to go

Best Time To Visit
Late June through mid-August. Warmest weather, longest days, most reliable tour vessel operations, and frequent glacier calving in afternoon light.
Best Visit Times
Early morning departures for clearer skies and fewer ice chunks in approach waters; late morning to early afternoon for optimal glacier calving light
Sunrise Sunset Quality
Excellent during May–June (extended twilight, alpenglow); diffused light in July (midnight sun); good coloring again in late August–early September
Best Season
Late June through mid-August (warmest, longest days, most reliable tour operations)
Busiest Season
July (peak tourist season; book tours in advance)
Seasonal Access
Late-May through early-September. Commercial tour operations are seasonal; winter access unavailable due to icebergs and storms.
Road Opening Dates
N/A (seasonal boat tours late-May through early-September)
Snow Lingering
Glaciers present year-round; seasonal snowline varies with summer temperatures
Winter Access
No commercial tour access November–April; private travel hazardous due to icebergs and winter storms
Weather Patterns
Frequent fog, afternoon winds, rapid weather changes, and high precipitation. Storms can delay or cancel tours. Bring rain gear and prepare for cold, damp conditions.

What you will experience

Attraction Type
Tidewater Glacier
Main Features
Margerie Glacier (active tidewater glacier with calving face), Grand Pacific Glacier (receded, heavily debris-covered), tidewater fjord, harbor seals on ice floes, seabird colonies
What Youll See
Bright blue glacier ice actively calving into the fjord, harbor seals hauled out on ice chunks, black-legged kittiwakes and herring gulls in flight, puffins in the water, milky blue-green meltwater, massive debris-laden glacier terminus
Unique Characteristics
Furthest navigable point into Glacier Bay, showcasing active tidewater glacier dynamics. Dramatic contrast between Margerie (actively advancing and calving) and Grand Pacific (heavily retreated). Named by John Muir; inlet renamed in 1911 for geographer Ralph Stockman Tarr. Part of UNESCO World Heritage Site.
Photo Opportunities
Margerie Glacier calving events in afternoon light, harbor seals on ice floes, seabirds against glacier backdrop, glacial ice formations and bergy bits, wide-angle fjord vistas from vessel deck
Photography Spots
Bow of vessel for glacier approach shots, port and starboard railings for seal and bird photography, stern for wide-angle fjord vistas
Best Viewpoints
Bow and railings of commercial tour vessel during approach to glacier face
Common Wildlife
Harbor seals, black-legged kittiwakes, herring gulls, glaucous-winged gulls, tufted puffins, occasional sea otters and humpback whales
Best Wildlife Times
July–August for peak seal presence and seabird activity; afternoon hours for glacier calving observation and puffin sightings
Geological Formation Type
Tidewater Glacier
Scientific Interest
Tidewater glacier dynamics and rapid retreat as climate indicator, glacial striations and ice-rock interactions, harbor seal ecology on glacial ice, seabird colonies, Holocene isostatic rebound and fjord evolution
Stargazing Quality
Excellent in May–early June (twilight); limited in mid-July (midnight sun); good again in late August–early September

Facilities, fees & access

Entry Fees
No park entrance fee. Tour operator fees apply (contact Juneau-based tour operators for current pricing).
Permits Required
No
Restrooms Available
Yes
Restroom Type
Head facilities on commercial tour vessels (amenities vary by operator)
Picnic Areas
No
Water Available
No
Cell Service
Spotty to unreliable; no coverage once offshore
Interpretive Signs
No
Accessibility
Commercial tour vessels have standard maritime deck and cabin access. Persons with mobility limitations should contact tour operators in advance to discuss accessibility accommodations and available assistance.
Accessibility Level
Commercial tour vessel access only
Nearby Services
Gustavus, Alaska (basic lodging, restaurants, outfitters); Juneau (full services); tour operators headquartered in Juneau
Nearby Facilities
Bartlett Cove (ranger station, dock, primitive campground 9 miles from Gustavus); Gustavus (limited lodging, fuel, restaurants); full services in Juneau
Family Friendly Notes
Suitable for all ages if family members can board a vessel and tolerate extended boat time (8–10 hours). Motion sickness is common in rough waters; bring medication. Weather is cold; dress in layers. Children must be supervised on deck at all times due to open railings and proximity to water.

Safety

Safety Considerations
Glacial calving is unpredictable; vessel maintains safe distance (typically 0.5–1.0 mile). Water temperature approximately 40°F; hypothermia risk if immersed. Respect 100-yard bear distance and 25-yard seal distance. Weather can change rapidly; fog, wind, and rain are frequent. Wave action from calving events can shake the vessel.

Nearby

Nearby Attractions
Margerie Glacier, Grand Pacific Glacier, Johns Hopkins Inlet, Lamplugh Glacier, Geikie Inlet, Bartlett Cove, Beardslee Islands
Connecting Trails
None (boat access only)
Trailheads Here
None (boat-based destination only)

Planning advice

Insider Tips
  • Margerie Glacier calves most frequently in warm afternoons; position yourself on the bow in the hour before sunset for optimal viewing
  • Bring powerful binoculars (10x42 magnification or better) for harbor seals and puffins 50+ yards away
  • Grand Pacific's debris-covered face is not dead ice—it is still a glacier buried under its own sediment; ask your guide why it differs so dramatically from Margerie
  • The milky blue water is glacial flour (fine silt particles), not algae or chemical dye
  • Most vessels reach the glacier face by mid-afternoon; late-arriving tours risk turning back without approaching close enough for photography
Tips Advice
  • Afternoon visits offer best light for glacier calving; morning departures provide clearer skies and smoother approach waters
  • Bring powerful binoculars (10x magnification) to observe harbor seals, puffins, and kittiwakes at distance
  • Watch the glacier face for visible striations—scratches left by rock-laden ice thousands of years ago
  • Margerie's bright face is actively calving; Grand Pacific is heavily retreated—ask your guide why they differ so dramatically
  • Motion sickness is common on the 8–10 hour journey; take medication pre-emptively and stay on deck for fresh air
  • Respect the 100-yard bear safety distance and 25-yard seal distance enforced by vessel operators; do not lean over railings

More details

Park Area
West Arm
Recent Updates
Both glaciers continue retreating; exact terminus positions change yearly. Check NPS website or tour operators for current access conditions and ice dynamics before booking.
Elevation Feet
0
Visitor Center Present
No
Guided Tours Available
Yes
Lake Size
N/A (fjord, not a lake)
Fishing Nearby
No
Swimming Allowed
No
Boating Allowed
Yes
Climbing Areas
No
Review Summary
Visitors consistently cite glacier views and wildlife as highlights. Long tour duration (8–10 hours) and motion sickness risk are common drawbacks. Weather delays are frequent and unavoidable. Most visitors agree the experience justifies the logistical challenges and cost.

Location

Frequently asked questions

Do I have to take an organized tour to see Tarr Inlet?

Yes. The inlet is accessible only by boat. Commercial tours from Gustavus are the standard; private kayak expeditions require permits and significant backcountry experience.

Will I definitely see glaciers calving?

Margerie Glacier calves regularly, especially in warm afternoons, but calving is never guaranteed. Grand Pacific rarely produces visible calving events. You will see both glaciers; dramatic calving is common but not certain.

Is the fjord water really that blue-green color?

Yes. It is glacial flour—fine silt particles suspended in meltwater that scatter light, creating the characteristic milky blue color. Not paint, not algae, not dye.

Will I get seasick on the 8–10 hour boat ride?

Motion sickness is common, especially on the approach to the inlet. Take motion-sickness medication pre-emptively, stay on deck for fresh air, and avoid reading or screen time below deck. Some rough days will be rough.

How close can we get to the glacier face?

Tour vessels maintain a safe distance (typically 0.5–1.0 mile) to avoid waves and ice debris generated by calving events. This distance is both mandatory for safety and protective of the ecosystem.

What animals will we actually see?

Harbor seals on ice are nearly certain. Seabirds (kittiwakes, gulls, puffins) are common. Bears are possible but rare. Whales are seasonal. Bring binoculars to see details.

Why does Margerie Glacier look so different from Grand Pacific?

Margerie is actively advancing and calving, fed by snow from high-elevation sources. Grand Pacific is heavily retreated and debris-covered, buried under moraine and outwash from the Ferris Glacier feeding into it. Both are products of the same fjord-carving glacier; they simply are at different stages of decline.

Icy Strait

Milky water crowded with whales and eagles. Alaska's prime marine wildlife corridor, best May-September.

Mount Fairweather

Tallest mountain in Glacier Bay at 15,300 ft, visible from 70+ miles away on clear days.

Mount Wright

Mount Wright (4,967 ft) marks Muir Inlet's gateway—a glacial-carved peak visible from cruise and kayak routes.

Sources

Editorial review: YourNPGuide Editorial Team. Information is compiled from official sources, verified traveler reviews, and editorial research; no firsthand visit is implied unless explicitly documented. Learn how YourNPGuide works.

Last updated July 2026. Report an issue.