Southgate was settled in the 1850s as a farming area spreading from the settlement roads of Hwy 10 and Hwy 6. The original settlers were from England, Scotland, Ireland, Wales and other European countries. Soon after 2 rail lines were built running north–south near Hwy 10 through Dundalk and Proton Station and Hwy 6 through Holstein. The most recent arrivals in Southgate are Mennonites mostly from the Kitchener-Waterloo area. Southgate has several churches representing Catholic, Anglican, Protestant and Mennonite denominations. Dundalk is the starting point of the Grey County CP Rail Trail, a multi-purpose trail which runs through downtown Dundalk on the old railline to
Owen Sound. Dundalk is the hub of the regional ATV and snowmobile networks in the region. The Highpoint Campground is a municipally owned campground in downtown Dundalk in Dundalk Memorial Park. The village of Dundalk hosts many tourism events including the Dundalk Fair and Canadian Open Dance Competition, Horse Shows, Family Recreation Weekend, Automotive Swap-Meet & Flea Market and Santa Claus Parade. The Dundalk Fair and Canadian Open Dance Competition is held the 2nd weekend of September. The Dance Competition includes step dancing, clogging, square dancing and group step dancing. The Fair is a traditional fall fair which has been held for over 160 years. It includes saddle horse shows, harness racing, demolition derby, tractor pulls, classic car show, garden tractor races, Ambassador of the Fair crowning, amusement rides and over a hundred competitions judging jam to livestock. The village of Holstein hosts many events each year including: the Holstein Maplefest, a Canada Day Fireworks display, Holstein Santa Claus Parade and annual drama productions. Landmarks and businesses in Holstein are the Holstein General Store, Holstein Feed Mill, Holstein Park and Dam, Egremont Optimist's Community centre, Holstein Cenotaph, Knox Holstein Presbyterian Church and Egremont Community School. The Holstein Dam is on the Waterfalls of Grey County Tour. Holstein's Maplefest is hosted at Love's Sugarbush the second weekend in April and has displays of pioneer activities, modern production of maple syrup, games, booths from local merchants, artists and local community groups and has live shows and children's entertainment. Butter Tarts and Buggies is a new tourist attraction in Southgate, Wellington North, Minto, Mapleton and West Grey which features many of the Mennonite businesses in the Holstein area. A special feature of the Butter Tarts and Buggies is an authentic Mennonite horse drawn buggy ride through 2 Mennonite working farms and scenic backroads just outside Holstein.
Varney International Speedway is located in Varney on the western edge of Southgate. It is the only speedway in Ontario to feature a 33° high-bank asphalt racing surface. ==Infrastructure==