April through October (Flexible Dates) in Wells, NV (Northeast)
"Ranch activities include: horseback riding, Cattle Roundups, trap-shooting, arena games, roping, Bird watching, hiking, camping, rock-hunting, ATV trips, hot tub, relaxing,—And more!"
Nevada: I like the sound of Seven Mile Canyon Ranch ($170 pp per day, plus activities) in Virgina City, which looks like a really nice town. But their website doesn't seem to work.
Wyoming: The cheapest week-long dude ranch experience I've found is at the CM Ranch in Dubois, WY. Two adults and a baby about $3700 all inclusive. I looked at 30 dude ranches in Wyoming, they are all very similarly priced and none accept shorter-than-4-night stays in the summer.
Colorado: About 30 dude ranches are listed here, I haven't looked at any but assume they are similarly priced to the ones in Wyoming.
