The CDC says masks may make it hard to breathe in high-intensity sports.
Additional guidance on games and spectators is forthcoming.
The group is appealing the judge's decision.
Let Them Play MN filed the lawsuit on behalf of several unnamed youth players and coaches.
Some are preparing for an extended shutdown period.
Gov. Walz said new guidance will be released "within the next day or so."
The latest guidance issued by the Minnesota Department of Health came out Friday afternoon.