Poly-Tex, Inc. - Manufactures both commercial and retail greenhouses, store displays, fixtures, ventilation systems, coverings. Weather Underground: Castle Rock, Minnesota, Forecast - Active advisories, if any. Current conditions, forecast, local radar and satellite. Castle Rock Township - Official web site of town government. Announcements, town officials, calendar, information on permits, office hours. Weather Underground: Castle Rock, MN Weather - Current conditions and a short-range forecast. Castle Rock Township Topographic Map - Shows Castle Rock the unincorporated village, Castle Rock the pillar, Farmington city limits, as well as roads. Also a small map indicating where the town is situated in Minnesota. AccuWeather: Castle Rock, MN - Current conditions, 15-day weather forecast, wind chill or heat index. Castle Rock Township Road Map - Closeup view of the town of Castle Rock, Minnesota. Interactive.