4 listings in Columbia, 4 of them farmers markets. 1 has a market day and hours from a public register or the market's own website, and 1 appears in the USDA SNAP retailer register. Market days in Columbia: Thursday (1).
Few Columbia listings have a schedule or SNAP authorization we could source. Ellicott City, 4 miles away, has 7 listings with more sourced detail; see also all of Maryland.
Merriweather District's Farmers Market is authorized SNAP retailer in the USDA register. Ask at the information table how EBT tokens work at that market.