To get to Brown-Lowery Provincial Park from Calgary, take highway 22X west, turn south on hwy 22 towards Millarville, then west on Plummer's Road. Then turn left at the T intersection, then drive for about 8.2 km until you get to the parking area.
This cache should be accessible year-round, although in the winter the trail can become very icy.
It's about a 1.2 km hike to the cache. It's near an old mill site with one building still somewhat standing.