Goodfellas Diner is a locally owned, all-American diner in Longmont, Colorado, established in 2013, serving breakfast, lunch, and dinner — breakfast all day, every day. Rated 4.4★ from 2,183 Google reviews. 2026 Best of Longmont winner in three categories: Best Breakfast/Brunch, Best Burrito, and Best Pie. Open daily 7am–8pm at 623 Ken Pratt Blvd.