I am planning to climb Denali. Who are the permitted guide services?

If you mean commercially guided climbs of Denali (Mount McKinley), the National Park Service currently lists seven—and only seven—authorized mountain guide services:

The NPS explicitly says these are the only companies permitted to guide on Mount McKinley, and unauthorized guiding can result in the climbing registration being voided and the party being removed from the mountain.

A useful distinction

You do not have to use a guide—private expeditions can climb independently. But if you hire a commercial guide, it must be one of the seven above.

For the 2026 season, NPS's current mountaineering rules also specify a maximum of 3 clients per guide (5 clients per guide for mountaineering courses), with a total group size generally capped at 12.

If you're deciding among these seven, I can also compare them for Denali specifically—success/experience, expedition length, cost, group size, guide-to-client ratio, and reputation—and tell you which 2–3 I'd shortlist.

The National Park Service (NPS) strictly limits commercial mountaineering on Mount McKinley (Denali). There are currently only seven officially authorized and permitted concessionaire guide services permitted to operate on the mountain.

Using an unpermitted or unauthorized guide service is illegal; doing so will result in your registration being voided, being removed from the mountain, and receiving a citation.

The seven authorized Denali guide services are:

• Alaska Mountaineering School (AMS): Based locally in Talkeetna, Alaska, specializing heavily in Alaskan range logistics and expedition courses.
• Alpine Ascents International: Well-known international high-altitude expedition operator.
• American Alpine Institute (AAI): Offers comprehensive expedition training and guided climbs on Denali.
• International Mountain Guides (IMG): Conducts major global and Denali-specific high-altitude climbs.
• Mountain Trip: Frequently operates Alaska-focused and Denali West Buttress expeditions.
• NOLS (National Outdoor Leadership School): Offers intensive mountaineering expedition courses and leadership training on the peak.
• RMI Expeditions (Rainier Mountaineering Inc.): Renowned Pacific Northwest and global guide service with an established Denali program.

You can verify details or check for any updates directly via the NPS Denali Mountaineering Guides Page.

If you'd like, let me know:

• What route you are considering (West Buttress, Muldrow Glacier , etc.)
• Your prior mountaineering experience (e.g., Rainier, Aconcagua, or 6,000m+ peaks)
• Whether you need help comparing logistics or training prerequisites for these operators

I can help you narrow down the best fit for your climb.

If you mean climbing Denali (Mount McKinley) itself via the standard West Buttress/other routes in the historic park area, the National Park Service currently lists seven authorized guide services:

1. Alaska Mountaineering School (AMS) — Talkeetna, Alaska
2. Alpine Ascents International (AAI) — Seattle, Washington
3. American Alpine Institute (AAI) — Bellingham, Washington
4. International Mountain Guides (IMG) — Ashford, Washington
5. Mountain Trip Alaska — Telluride, Colorado / Alaska operations
6. National Outdoor Leadership School (NOLS) — Alaska programs
7. Rainier Mountaineering, Inc. (RMI) — Ashford, Washington

The NPS explicitly says these seven are the only companies authorized to guide on Mount McKinley; using an unauthorized guide can result in removal from the mountain and citation.

One important distinction

Denali has a somewhat unusual permitting system. The seven above are the authorized mountaineering concessioners for Denali's main climbing area. Separately, the NPS issues Commercial Use Authorizations (CUAs) for guided mountaineering/climbing in certain post-1980 park additions and preserve areas. Those CUA operators aren't necessarily authorized to lead an expedition on Denali itself.

For the 2026 season, the NPS mountaineering registration fee is $450 per climber ($350 for climbers 24 or younger), and registration must be completed at least 60 days before the requested departure date.

If you're deciding among the seven, I can also compare them for Denali specifically—cost, expedition length, guide-to-client ratio, success/experience, and which are best for a first Denali attempt.

The National Park Service (NPS) strictly limits commercial mountaineering on Denali (Mount McKinley). Currently, there are only seven authorized concessionaire guide services permitted to legally lead climbs on the mountain.

Using an unauthorized guide service is illegal; if caught, your registration will be voided, you will be removed from the mountain, and you will be issued a citation.

The seven permitted operators are:

1. Alaska Mountaineering School – Based locally in Talkeetna, Alaska, specializing in comprehensive mountaineering courses and expeditions.
2. Alpine Ascents International – Offers scheduled guided expeditions on Denali's standard West Buttress route.
3. American Alpine Institute – Known for rigorous instructional elements and structured team ratios.
4. International Mountain Guides (IMG) – Provides large-team support structures and experienced high-altitude leadership.
5. Mountain Trip – Locally rooted in Colorado/Alaska with strict lead-guide experience requirements.
6. NOLS (National Outdoor Leadership School) – Focuses heavily on an extended, educational, wilderness-leadership expedition format.
7. Rainier Mountaineering, Inc. (RMI) – Operates guided climbs with flexible scheduling and extensive logistical support options.

(Note: While air taxis like Talkeetna Air Taxi and K2 Aviation are essential for flying you and your gear onto the glacier, they are permitted air carriers, not climbing guide services.)

Are you planning to tackle the West Buttress route , and do you need help comparing the group sizes or itineraries of any of these seven operators?

The National Park Service (NPS) authorizes a strict, limited set of official concessionaires permitted to guide mountaineering expeditions on Denali (Mount McKinley). Using an unauthorized or illegal guide service will result in your registration being voided, removal from the mountain, and citations.

The seven officially authorized concessionaires for Denali expeditions are:

• Alaska Mountaineering School (AMS)
• Alpine Ascents International
• American Alpine Institute (AAI)
• International Mountain Guides (IMG)
• Mountain Trip
• National Outdoor Leadership School (NOLS)
• Rainier Mountaineering Inc. (RMI)

If you'd like, let me know:

• Your prior mountaineering experience and high-altitude background
• Whether you are looking for a full expedition or a mountaineering training course first

I can help you compare which of these permitted services aligns best with your goals.

For Denali (Mount McKinley), the National Park Service currently lists seven authorized commercial guide services. These are the only companies permitted to lead commercial expeditions on the mountain.

1. Alaska Mountaineering School (AMS) — Talkeetna, Alaska
   

2. Alpine Ascents International (AAI) — Seattle, Washington
   

3. American Alpine Institute (AAI) — Bellingham, Washington
   

4. International Mountain Guides (IMG) — Ashford, Washington
   

5. Mountain Trip Alaska — Telluride, Colorado
   

6. NOLS (National Outdoor Leadership School) — Palmer, Alaska
   

7. Rainier Mountaineering, Inc. (RMI) — Ashford, Washington
   

The NPS says using an unauthorized guide can result in the team's registration being voided, removal from the mountain, and a citation.

A couple of important 2026 details

For the 2026 season, Denali climbing registration requires a special-use permit, and climbers must generally register at least 60 days before their start date. The 2026 mountaineering fee is $450 per climber, or $350 for climbers age 24 or younger at the start of the climb.

If you're deciding among these seven, I can also compare them for Denali's West Buttress—including typical expedition length, price, guide-to-client ratio, success/experience considerations, and which is best for a first Denali attempt.

Yes. For a guided climb of Denali (Mount McKinley), the National Park Service currently lists seven authorized guide services. These are the only companies permitted to lead commercial expeditions on Denali.

1. Alaska Mountaineering School (AMS) — Talkeetna, Alaska
   
2. Alpine Ascents International — Seattle, Washington
   
3. American Alpine Institute (AAI) — Bellingham, Washington
   
4. International Mountain Guides (IMG) — Ashford, Washington
   
5. Mountain Trip Alaska — Anchorage/Telluride
   
6. National Outdoor Leadership School (NOLS) — Palmer, Alaska
   
7. Rainier Mountaineering, Inc. (RMI) — Ashford, Washington
   

The NPS specifically warns that unauthorized guiding is illegal, and an illegally guided team can have its registration voided and be removed from the mountain.

A useful distinction

You do not have to use a guide—private expeditions are permitted—but if you hire a guide, it must be one of these seven. www.nps.gov For the 2026 season, the NPS also confirms that climbs of Denali require the appropriate mountaineering registration/permit process.

If you're deciding among the seven, I can also compare them for Denali specifically—success rates, trip length, cost, guide-to-client ratios, acclimatization strategy, and reputation—and tell you which 2–3 I'd shortlist.

There are currently seven authorized concessionaire guide services legally permitted by the National Park Service to lead commercial climbing expeditions on Denali.

The official approved guide services are:

• Alaska Mountaineering School

If you'd like, I can provide details on:

• Registration timelines and current permit fees
• Recommended physical training regimens
• Typical gear lists and logistics

Let me know what aspect of your preparation you'd like to focus on next.

If you mean commercially guided ascents of Denali (Mount McKinley), the National Park Service says only seven guide services are authorized to lead commercial expeditions on the mountain.

The NPS explicitly warns that using an unauthorized guide can result in your climbing registration being voided, removal from the mountain, and a citation.

One important 2026 wrinkle

I found some third-party material claiming there are only six operators, but the NPS's own Mountaineering Guides page still lists seven, including NOLS, and NOLS continues to advertise a 2026 Denali expedition for qualified alumni. www.nps.gov So I would treat the NPS list as authoritative rather than relying on commercial comparison sites.

Also, Denali's current 2026 CUA documentation confirms that guided mountaineering, climbing, and ski mountaineering are authorized activities and lays out requirements such as a maximum of three clients per guide.

If you're seriously considering the climb, I can also compare these seven operators—cost, trip length, guide-to-climber ratio, typical dates, prerequisites, and reputation—and tell you which 2–3 I'd shortlist for a first Denali attempt.

The National Park Service (NPS) officially authorizes seven concession-permitted guide services to lead mountaineering expeditions on Denali (Mount McKinley).

It is the individual climber's responsibility to ensure that any commercial guide service chosen is on this official list. Using an unauthorized or illegal guide service will result in your registration being voided, being removed from the mountain, and receiving a citation.

The seven authorized Denali guide services are:

• Alaska Mountaineering School (AMS) – Based in Talkeetna, AK; highly focused on instructional and expedition-style small teams.
• Alpine Ascents International – Based in Seattle, WA; offers a large schedule of seasonal expedition departures.
• American Alpine Institute (AAI) – Based in Bellingham, WA; operates comprehensive multi-week expedition structures.
• International Mountain Guides (IMG) – Based in Ashford, WA; known for structured multi-guide team setups.
• Mountain Trip – Based in Telluride, CO; an established Alaskan Range concessionaire with deep lead-guide experience standards.
• National Outdoor Leadership School (NOLS) / NOLS Expeditions – Based in Lander, WY; heavily focused on educational wilderness expeditions.
• Rainier Mountaineering Inc. (RMI) – Based in Enumclaw, WA; offers traditional expedition support and flexible scheduling.

Note: If you are booking through a third-party outdoor retailer or travel agent that resells a Denali climb, always verify the legal operating name of the actual NPS-authorized concessionaire listed above.

If you'd like, let me know:

• Your prior mountaineering experience or highest peaks climbed
• Whether you are looking for an instructional course-style climb or a standard guided expedition

I can help you compare these specific operators based on your background.