T-Mobile Park, formerly known as Safeco Field, opened on July 15, 1999, in Seattle’s SoDo neighborhood as the home of the Seattle Mariners. Built at a cost of $517 million, the ballpark replaced the aging Kingdome and ushered in a new era of baseball for the Pacific Northwest, debuting with a game against the San Diego Padres before going on to become one of the most beloved venues in the sport.
One of the park’s most distinctive features is its retractable roof, an engineering marvel spanning nearly nine acres and weighing approximately 22 million pounds. Unlike fully enclosed stadiums, T-Mobile Park’s roof slides open to preserve an open-air feel while shielding fans from Seattle’s famously rainy weather. The venue adopted its current name in 2019 after T-Mobile secured a 25-year, $87.5 million naming rights deal, replacing the Safeco Field branding that had defined the park for nearly two decades.
Stats at a Glance
- Team(s): Seattle Mariners (MLB)
- Location: SoDo, Seattle, Washington
- Opened: July 15, 1999
- Capacity: 47,368
- Construction Cost: $517 million
- Retractable Roof: ~9 acres, 22 million lbs
The Fan Experience
T-Mobile Park pairs natural Kentucky Bluegrass and Perennial Ryegrass with a neo-traditional brick façade, giving the park a timeless feel inside Seattle’s modern skyline. The Bullpen Market behind left field offers local food vendors, open-pit barbecue, and interactive games, while the Children’s Hospital Playfield in center field provides a baseball-themed playground for younger guests. Edgar’s Restaurant, named after Mariners legend Edgar Martínez and added in 2012, anchors the left-field corner with Pacific Northwest cuisine.
Bronze statues of franchise icons Ken Griffey Jr., Edgar Martínez, Ichiro Suzuki, and beloved broadcaster Dave Niehaus greet visitors around the park, giving T-Mobile Park a deeply personal connection to Mariners history. Field dimensions (331 ft to left, 401 ft to center, 326 ft to right) favor pitchers on the pull side, and a manual scoreboard alongside an 11,435-square-foot HD video display blend old-school charm with modern spectacle.
Notable Events and Milestones
T-Mobile Park hosted the 2023 MLB All-Star Game on July 11, 2023, drawing an attendance of 47,159 — Seattle’s third time hosting the Midsummer Classic, following the Kingdome in 1979 and Safeco Field in 2001. The stadium also served as the venue for the 2024 NHL Winter Classic on January 1, 2024, demonstrating its versatility far beyond baseball season.
Since opening, the ballpark has seen continuous upgrades, including outfield fence adjustments in 2013 to boost offensive production. The retractable roof remains a crown jewel of stadium engineering — capable of opening or closing in 10 to 20 minutes, self-grounded against lightning, and built to withstand winds up to 70 mph.
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T-Mobile Park FAQs
When did T-Mobile Park open?
T-Mobile Park opened on July 15, 1999, under the name Safeco Field, hosting its first game between the Seattle Mariners and the San Diego Padres.
What was T-Mobile Park called before?
The ballpark was named Safeco Field from its 1999 opening through the end of the 2018 season. T-Mobile acquired the naming rights in a 25-year, $87.5 million deal that took effect January 1, 2019.
Does T-Mobile Park have a retractable roof?
Yes. T-Mobile Park’s retractable roof spans nearly nine acres and weighs approximately 22 million pounds. It opens or closes in 10 to 20 minutes using 128 steel wheels powered by electric motors, protecting fans from rain while preserving an open-air atmosphere.
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Photo: MyName (Cacophony) / CC BY-SA 3.0, via Wikimedia Commons.