The Horse Lake Horde is a 25-Swarmer Horde Killer target near the Caldera Hydro Dam reservoir in the Cascade. It is one of the smallest Hordes in the game and a good first try.
Use a few Molotovs on the pack, then an SMG or shotgun from a doorway or ladder. Keep the bike close in case it goes wrong.
Hordes rest in their hibernation spot during the day and go out to feed and drink after dark. Hitting a sleeping Horde lets you set up traps first. Every Swarmer drops an ear, so loot the field afterward for the bounty collector.
It becomes a Horde Killer target after We've All Done Things.
This is where Deacon first learned O'Brian was still alive.
Cascade Highway Horde
The Cascade Highway Horde is a 50-Swarmer Horde Killer target along the Santiam Highway near the logging camp. It opens after We've All Done Things and clears one of Deacon and Boozer's old danger spots.
Little Bear Lake Horde
The Little Bear Lake Horde is a 30-Swarmer Horde Killer target in the Cascade that often blocks the old Belknap Tunnel route. It opens after We've All Done Things and is an easy one to start with.
O'Leary Mountain Horde
O'Leary Mountain Horde is a 25-Swarmer Horde in Cascade, one of the Horde Killer targets. It opens after We've All Done Things. Clear it for 2,000 XP and 1,600 Trust at Copeland's Camp.
Image: Bend Studio / PlayStationBear Creek Hot Springs Horde
The Bear Creek Hot Springs Horde is a 50-Swarmer Horde Killer target in Belknap, north of Tucker's Hot Springs camp. It opens after We've All Done Things and pays well in Hot Springs Trust for its size.