Can you keep a combined trout (brown, cutthroat, lake, rainbow and tiger hybrid) in North Dakota?

No minimum size, three a day combined across all five trout types.

ND G&F source page

What we left out on purpose

• Zander are folded into the walleye/sauger/saugeye combination specifically at Spiritwood and Alkali lakes (Stutsman County) — neither is a water this site covers, so that exception isn't modelled.
• The Red River and Bois de Sioux River carry their own, lower walleye/pike/catfish numbers (3/3 and 5 with a 1-fish-over-24-inch catfish cap regardless of licenses held) — not modelled since this site doesn't cover either river.
• Three tiny posted waters (OWLS Pond, State Fair Pond, McDowell Dam) run full or seasonal catch-and-release rules — not modelled, none is a water this site covers.
• Legal live baitfish (150/150 combined) and leeches (300/300) are bait-possession limits, not sport-catch limits, and are not modelled here — consistent with excluding baitfish species elsewhere in this silo.
• Snapping turtles, frogs, salamanders and crayfish carry their own limits in the same statewide table but are not finfish and are out of this silo's scope.