Alterra Mountain Co. has thrown down an $899 season pass that offers unlimited skiing at 12 resorts and a lower-cost version to replace the beloved Rocky Mountain SuperPass, promising a season-pass war that will challenge Vail Resorts’ previously unrivaled Epic Pass and transform the ski resort industry.

The Ikon Pass — on sale March 6 at ikonpass.com — will offer unlimited access to Winter Park, Copper Mountain, Steamboat and Eldora and eight ski areas in California, Vermont, West Virginia and Canada, plus seven days of skiing each at six destination resorts: Utah’s Deer Valley, Wyoming’s Jackson Hole, Montana’s Big Sky, Canada’s Revelstoke, and Vermont’s Killington and Sugarbush. It also comes with a total of seven days at the four Aspen Snowmass resorts, AltaSnowbird in Utah, SkiBig3 in Canada (Banff Sunshine, Lake Louise and Mt. Norquay), and the trio of Sunday River, Sugarloaf and Loon Mountain in New England.

We’ll do the math for you: 26 destinations in nine states and four Canadian provinces, totaling almost 64,000 acres.

As a rival for the Epic Local Pass, the $599 Ikon Base Pass provides unlimited access to eight ski areas, including Winter Park, Copper Mountain, Eldora and areas in California, West Virginia and Canada. It comes with five days at each — with holiday restrictions — of these resorts: Steamboat, California’s Mammoth, Deer Valley, Jackson Hole, Big Sky, Vermont’s Stratton and Killington, Revelstoke and Sugarbush, plus five total days at AspenSnowmass, AltaSnowbird, SkiBig3 and the New England mountains. The base pass has blackout dates between Christmas and New Year’s Eve and the holiday weekends in January and February.

Kids 12 and under pay $199 for the Ikon Pass and $149 for the Ikon Base Pass with the purchase of an adult’s pass.

Denver-based Alterra announced the pass details on Thursday, ending months of speculation since the company formed last year with the $1.7 billion acquisition of a dozen top-tier ski destinations. In the last 10 months, Alterra has accumulated more ski areas, including Deer Valley, and forged partnerships with almost a dozen resorts, including most recently SkiBig3 in Alberta, Canada, Revelstoke in British Columbia and Vermont’s Sugarbush.

The pass was built as a rival for the 10-year-old Epic Pass, which offers unlimited access to 11 destination ski resorts in Colorado, California, Utah, Vermont and Canada, including Vail, Beaver Creek, Keystone, Breckenridge, Heavenly, Park City and Whistler Blackcomb. Vail Resorts sold the 2017-18 Epic Pass for $869 for 2017-18 and reported sales of about 750,000 Epic and Epic Local passes.

In a season like 2017-18, with less-than-stellar snowfall, pass sales have kept Vail from losing too much money. The company’s lift ticket revenue is up 1.6 percent while visitor spending and overall visitation has declined nearly 11 percent through mid-January compared to the same period last season.

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Alterra wants the Ikon Pass to provide a similar immunity to the vagaries of snowfall. It follows the Epic Pass’s unlimited access, but borrows from the Mountain Collective’s SuperPass with limited days at a broader range of independent resorts that typically sell season passes for twice or even three times the price of the Epic Pass. Alterra’s seven-day access was likely selected as a way to drive two long-weekend trips to the destinations, unlike the two days at 16 hills provided by the Mountain Collective, nine of which are now Ikon Partners.

“We spent a lot of time looking at travel patterns of popular current and former products and built the Ikon Pass based on where those guests were going, and how often,” said Erik Forsell, Alterra Mountain Co.’s chief marketing officer. “We also balanced the guest experience and the desires and needs of each destination and picked a number that could serve a lengthy vacation and regular days in the mountains.”

The Epic Pass followed that week-long access model when it announced last month that it was adding seven days at Telluride to its 2018-19 pass, which Telluride resort ownership hopes drives either multiple visits or a prolonged vacation.

Here are the details:

IKON PASS, $899

Unlimited access with no blackout dates to 12 destinations: Steamboat, Winter Park Resort, Copper Mountain Resort, Eldora Mountain Resort, Squaw Valley Alpine Meadows, Mammoth Mountain, Big Bear Mountain Resort, June Mountain, Stratton, Snowshoe Mountain, Tremblant and Blue Mountain.

Seven-day access to each of these resorts: Deer Valley Resort, Jackson Hole Mountain Resort, Big Sky Resort, Killington Resort, Revelstoke Mountain Resort, Sugarbush Resort.

Seven-days combined at: Aspen Snowmass’ four hills: Aspen Mountain, Snowmass, Aspen Highlands, Buttermilk; AltaSnowbird; SkiBig3’s Banff Sunshine, Lake Louise and Mt. Norquay, and the New England trio of Sunday River, Sugarloaf and Loon Mountain.

Child Ikon Passes (12 and under) will be available through April 9 for $199 with the purchase of an adult Ikon Pass. Military and college discounts will be available.

IKON BASE PASS, $599

Unlimited access: Winter Park Resort, Copper Mountain Resort, Eldora Mountain Resort, Squaw Valley Alpine Meadows (holiday restrictions), Big Bear Mountain Resort, June Mountain, Tremblant, Blue Mountain, Snowshoe Mountain.

Five days, with holiday restrictions, at each of these resorts: Steamboat, Mammoth Mountain, Deer Valley Resort, Jackson Hole Mountain Resort, Big Sky Resort, Stratton, Killington Resort, Revelstoke Mountain Resort, Sugarbush Resort.

Five days combined, with holiday restrictions at all, at: Aspen Snowmass’ Aspen Mountain, Snowmass, Aspen Highlands, Buttermilk; AltaSnowbird; SkiBig3’s Banff Sunshine, Lake Louise, Mt. Norquay and the New England trio of Sunday River, Sugarloaf and Loon Mountain.

Child Ikon Base passes (12 and under) through April 9 for $149 with the purchase of an adult Ikon Base Pass.