Late February '21 (more than 7 yrs from original post already !???? Where did the time go???)
Planned to go somewhere else, but very high wind made me seek shielded foothills instead of high alpine. Horton Hill gets lots of afternoon sunshine, so it looked like a good choice for few hours leg stretcher. Following my own instructions went out from Lusk parking to Sibbald shoulder expecting some tracks, but there were none. No matter, initial rise was a bit awkward, but low snow & I was able to easily boot up. Higher up, just before that wide open meadow with best view of the day I intersected well broken trail & followed to the top. I thought it was coming from Horton Ranch & on descent followed it; eventually it merged at valley bottom with Horton Ranch - Lusk Recreation trail. My line was way better though & while you can get up pretty much anywhere, I stick with recommendation of walking out to Sibbald road shoulder & then heading up. Pics tell the story:

[Sibbald road as you walk out of Lusk recreation area parking. Head up open area on center left & follow easiest line up through semi-open forest afterwards]

[After initial steep bit looking back to Sibbald Road. That's Mt. Baldy upper left, and distance right is Yates Mtn a.k.a Barrier Lake lookout]

[View of Barrier Lake from large open meadow ~20 min from the top. This is much superior viewpoint from what you get from semi-forested Horton Hill summit]

[Further up view towards Yamnuska area; this bit had lots of deadfall, but it was easy to navigate through]

[Hunchback Hills to the east]

[Horton Hill summit, again with register that had couple of notebooks & plenty of entries]

[Lower down someone built a snowman. Guy looks quite happy

; too bad it is soon going to melt]
Total tally was ~3 hrs with 375m vertical, about 5km. Note: It is possible to extend the hike by continuing east on Horton Ridge to next bump, then descend forested slopes down to Sibbald Road ~2km east from Lusk parking. This can not be recommended as it involves much tedious bushwhacking and almost no views; returning the same way is best option.
Full report with GPS download link
here