Distance: 10 km (6 mi) return trip
Time: 3 - 6 hrs
Elevation gain: 430 m (1,400')
Maximum elevation: 1,281m (4,200')

Trailhead:  Thechàl Dhâl (Sheep Mountain) trailhead parking lot, 2.6 km (1.6 mi) up the Ä’äy Chù (Slims River) Valley from the Thechàl Dhâl Visitor Centre

Please note that during lambing season (May 1st to June 15th) there’s a closure of the additional route. Ensure that you turn back at the KM 5 post, at the end of the trail overlooking Forty-eight Pup Creek. Refer to the sandwich boards at the beginning of the access road and trail for more information.

You can really just go up as high as you'd like, you can connect the trail to the top of Sheep Mountain if you'd like.

More info here - https://parks.canada.ca/pn-np/yt/kluane/activ/randonnee-hiking/sheep