In-N-Out Burger will open its 400th restaurant in Meridian, Idaho, on Tuesday, Dec. 12. It is the Irvine-based chain’s first location in the Gem State.

Media in the Boise suburb have been watching for the opening for weeks and predicted the date days before In-N-Out announced in a news release on Monday. A story on Boise’s 103.5 KISS FM website said that In-N-Out staff were flying in from Phoenix for the launch, attributing the news to an anonymous Reddit post.

The article called the event history-making. And the Idaho Statesman called In-N-Out “Idaho’s most dreamed-of, begged-for fast-food chain.”

There’s a plan in place for stacked parking using four nearby dirt lots to deal with expected crowds, according to the Boise channel KTVB.

In-N-Out’s new Idaho team members could be serving a lot of hot beverages to its first customers. According to the Weather Channel, the Tuesday morning forecast is for temperatures south of 40 degrees with a chance of rain.

The drive-thru puts In-N-Out in eight states, after California, Nevada, Arizona, Utah, Texas, Oregon and Colorado. It has plans for two more, Tennessee and New Mexico.

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In-N-Out opened restaurant No. 399 in San Juan Capistrano last Thursday and 398 in Perris two weeks ago.

The chain, founded in 1948 in Baldwin Park, marked its 75th anniversary with an all-day festival in October.