Khloé Kardashian Spends 4th of July with Tristan Thompson in Idaho

Khloé Kardashian and Tristan Thompson are crushing co-parenting on a long holiday weekend ... hanging out together in Idaho with their kids.

The pair were spotted in Coeur d'Alene -- a lake town in Western Idaho that's a known fav spot for the Kardashian clan.

Check out the clip ... the two attended the local parade -- getting a look at a couple of the local horses with their little ones, True and Tatum Thompson, at their sides.

Tristan was a doting dad on Saturday ... lifting up Tatum onto his shoulders so his son could get a better look at all the action.

Of course, Khloé and Tristan aren't the only famous faces in town ... as we told you, Kendall Jenner, Jacob Elordi and Justin and Hailey Bieber held their own private party in the city last night -- going boating as a group.

The quartet jumped into a speedboat and put the pedal to the medal as they cut through the crystal clear ocean water.