Driving between the contiguous United States and the Alaska Highway

The Alaska Highway was completed in 1943 by the U.S. Army Corps of Engineers as a military access road. The Yukon and British Columbia sections were turned over to Canada six months after the end of World War II and was opened to civilian traffic in 1948. The original access routes were Alberta & British Columbia Highway 2 from Edmonton, AB to Dawson Creek, BC, and later the John Hart Highway (then-BC Hwy 2) from Prince George to Dawson Creek. The Alaska portion of the Alaska Highway was proposed to be designated as US Route 97, leading to a series of British Columbia highways being re-designated as BC Hwy 97 between Washington state and the Yukon; however the Yukon did not participate and the plan was ultimately cancelled.
Since that time, other corridors have been developed to improve access to the Alaska Highway, and depend on how much time you have and what you like to do. There are three routes that head Dawson Creek, British Columbia (mile zero of the Alaska Highway), and then a number of deviations from the main routes are possible, allowing you to customize the route to your personal schedule and interests.
According to the The Milepost, the primary choices to get to the Alaska Highway from the Lower 48 are:

• East Access Route - from Montana (Interstate 15), through Alberta
• Central Access Route - from eastern Washington state (US Highway 97) through British Columbia and Alberta
• West Access Route - from western Washington state (Interstate 5) through British Columbia

Get a copy of The Milepost, either in print or eBook form. (Print would be a better idea once you hit the road.) Billing itself as "the Bible of north country travel," this guide book covers the entire northwestern corner of North America in rich detail.

By car

The access routes start Great Falls, Montana; Ellensburg, Washington (where US Highway 97 intersects Interstate 90); and Seattle; however, that can be accessed from various points in Canada and the United States.
For travelers coming from the eastern United States and Canada, they can take the Trans-Canada/Yellowhead Highway (Hwy 16) and arrive in Edmonton.

By plane

There are various airports, depending on how much additional driving you want to do. Edmonton (YEG) is the nearest major international airport to mile zero of the Alaska Highway, with Calgary (YEG), Vancouver (YVR), Seattle (SEA), and Great Falls (GTF) also being options.

East Access Route

Runs from Great Falls, MT to Dawson Creek, BC, the majority of this route is a four lane divided highway.

• (exits 278-290) - head north on I-15.
• (Sweetgrass, MT/Coutts, AB) - open 24 hours, I-15 becomes Alberta Hwy 4.
• - population 98,000; follow Hwy 3 (Crowsnest Highway) west
• - population 3,000, follow Hwy 2 north.
• (exits 232-271) - population 1.2 million, the largest city in Alberta and Canada’s fourth largest metropolitan area. Travellers can either take Hwy 2 (Deerfoot Trail) through the city or Hwy 201 (Stoney Trail) as a bypass route. Intersects the Trans-Canada Highway (Hwy 1), which provides access to Banff.
• (exits 394-405) - population 100,000.
• - population 930,000, capital and second largest city in Alberta. Travellers can take Hwy 216 (Anthony Henday Drive) as a bypass route to the Yellowhead Highway (Hwy 16) and continue west.
• (exit 340) - Hwy 16 continues west to Jasper, follow Hwy 43 north.
• - population 10,000.
• - population 1,900; Hwy 49 provides access to Peace River and the Mackenzie Highway, connecting to the Northwest Territories.
• - population 63,000.
• - AB Hwy 43 becomes BC Hwy 2.
• - population 13,000; mile zero Alaska Highway.

Alternate routes

• Travellers coming from central and eastern Canada and the United States can approach Edmonton from the east via the Trans-Canada/Yellowhead Highway (Hwy 16) and link with East Access Route. Major border crossings include the Portal–North Portal Border Crossing (US 52/SK Hwy 39) near Estevan, Saskatchewan and the Pembina–Emerson Border Crossing (I-29/MB Hwy 75) south of Winnipeg.
• From Calgary, follow the Trans-Canada Highway (Hwy 1) west through and to the Icefields Parkway (Hwy 93) and travel north to . Connect with the Central Access Route and travel east and north to Grande Prairie.
• From Edmonton, follow Hwy 2 north through , , and , following the original overland access route to the Alaska Highway. Reconnect with the East Access Route at Grande Prairie, or take a cutoff via Hwy 49 to Dawson Creek; or follow Highway 16 (Yellowhead Highway) to the at the junction with Highway 40 in the hamlet of Entrance. Follow Highway 40 north to Grande Prairie, and from there to Dawson Creek.

Central Access Route

Runs from Ellensburg, WA to Grande Prairie, AB through Washington’s Okanogan valley and British Columbia’s Okanagan valley, the latter being a popular tourist area. Mostly a two lane highway.

• (I-90 exit 106) - population 19,00; exit Interstate 90 and travel north on US 97.
• - population 32,700, intersects US 2.
• (Oroville, WA/Osoyoos, BC), open 24 hours, US 97 becomes BC Hwy 97.
• - population 33,000 and major tourist destination.
• - population 115,000, largest city in the Okanagan and major tourist destination, intersects Hwy 97C just south of the city in Peachland.
• - population 38,500 and popular tourist destination.
• - population 90,000; follow Hwy 5 (Yellowhead Highway) north (exit 374).
• - population 7,000, provides access to Wells Gray Provincial Park.
• - follow Hwy 16 (Trans-Canada/Yellowhead Highway) east, western gateway to Mount Robson Provincial Park.
• (inside Jasper National Park) - population 4,600 and major tourist destination.
• - population 9,900; follow Hwy 40 (Bighorn Highway) north.
• - population 3,500.
• - population 63,000; merges with East Access Route (Hwy 43) and continues to .

Alternate routes

• From Peachland (just south of Kelowna), follow Hwy 97C west to , where travelers can either travel north on Hwy 5 (Coquihalla Highway) and reconnect with the Central Access Route in Kamloops, or continue on Hwy 97C to Cache Creek and connect with the West Access Route.
• From Kamloops, follow Hwy 1/Hwy 97 west to and connect with the West Access Route; this allows travelers to follow Route 97 the entire way.
• From Tete Jaune Cache, follow Hwy 16 (Trans-Canada/Yellowhead Highway) west to and connect with the West Access Route.

West Access Route

Runs from Seattle, WA to Dawson Creek, AB, linking the Interstate 5 corridor with the Alaska Highway.
Note: There are four land border crossings can used to cross into Canada; see Lower Mainland#From Washington state for more border information. This itinerary shows the shortest distance and bypasses metropolitan Vancouver.

• - city population 609,000/metro population 3.9 million; travel north on I-5
• (exits 250-258) - population 90,000; access to the Alaska Marine Highway; I-5 continues north to the Peace Arch and Pacific Highway border crossings and is the most direct route to Vancouver. Follow SR 539 north (exit 256)
• - population 12,000. SR 539 continues north to the Lynden-Aldergrove border crossing; follow SR 546 east and continue north on SR 9.
• (Sumas, WA/Huntingdon, BC) - open 24 hours: WA SR 9 becomes BC Hwy 11
• - population 141,000. Follow the Trans-Canada Highway (Hwy 1) east, Hwy 1 west heads into Vancouver.
• - population 6,200. The Trans-Canada Highway (Hwy 1) leave the freeway at exit 170 (the freeway becomes Hwy 5 (Coquihalla Highway)), continue north on Hwy 1.
• - population 1,000. Hwy 1 east and Hwy 97 south continue towards Kamloops, continue north on Hwy 97.
• - population 10,800
• - population 10,000
• - population 79,000. Largest city in northern British Columbia, intersects Hwy 16 (Trans-Canada/Yellowhead Highway)
• - population 2,600, intersects Hwy 29.
• - population 13,000; mile zero Alaska Highway

Alternate routes

• From Bellingham, continue into and go north on the scenic Sea to Sky Highway (Hwy 99) through and , reconnecting with the Western Access Route near Cache Creek.
• From Prince George, follow the Trans-Canada/Yellowhead Highway (Hwy 16) west, either taking the isolated (Hwy 37 north), located midway between Smithers and Terrace, and linking with the Alaska Highway near Watson Lake, Yukon; or continuing west to and linking with the Alaska Marine Highway ferry.
• From Chetwynd, follow Hwy 29 through and connect with the Alaska Highway near .

Continue to Alaska on the Alaska Highway.