Every CO2 supplier we could find in the Denver area (Colorado) was checked one by one, and 16 of them made the list. 4 will refill the cylinder you walk in with. 4 only swap it for a different tank, which matters if yours is new or an odd size. 8 would not confirm either way, so those are marked call to confirm rather than guessed at. 4 confirm food grade CO2 for anything you actually drink; the common sizes here are 20lb, 10lb, 2.5lb; most cover homebrew, soda, welding.
16places listed
4confirmed refill
4confirmed food grade
Last checked September 2026
Sorted for you: places that refill your own tank come first, then the most complete, confirmed listings. Exchange-only and unconfirmed spots follow.
Hours Mon-Wed 11:00-18:00; Thu-Fri 11:00-20:00; Sat 09:00-20:00; Sun 09:00-17:00
Official current CO2 refill page confirms on-site same-cylinder filling, beverage-quality CO2, SodaStream refills, kegerator refills, aquarium use, and fills up to 10 lb. Published sizes and pricing support the listed tank sizes. Email source: https://americanpaintballcoliseum.com/apply/.
Official current site explicitly says it fills CO2 and advertises both CO2 tank refills and exchanges. Published fill sizes include 2.5 lb, 5 lb, 10 lb, 20 lb, paintball tanks, and non-SodaStream 60L cylinders. Food-grade status was not explicitly stated. Email source: https://www.quirkyhomebrew.com/privacy-policy/.
Hours Mon-Fri 09:00-18:00; Sat 10:00-16:00; Sun Closed
Official current location page verifies this active Denver store. Recent current Denver refill guidance reports same-cylinder CO2 refills at this location and 20 lb tank swaps. The service claim is supported by a current secondary source rather than the official location page, so food grade remains unknown.
Hours Mon-Fri 09:00-19:00; Sat 09:00-15:00; Sun Closed
Current official site verifies the Hudson location. Current local business evidence continues to describe CO2 refills as a core service. The current official CO2 tank page lists 5 lb, 10 lb, 15 lb, 20 lb and 50 lb tanks, but does not explicitly tie every size to refill service, so tank_sizes remains unknown. Email source: https://www.centennialtap.com/rentals.
Hours Mon-Thu 09:00-21:00; Fri-Sat 09:00-22:00; Sun 10:00-20:00
Official current store page verifies the active Aurora location and contact details. The recently closed Brew Hut's current replacement-resource page specifically directs customers here for CO2 exchange. Same-cylinder refill and food-grade status were not established. Email source: https://chamberswineandliquor.com/chilled-wine-room/.
Official current branch page explicitly states walk-in customers can exchange CO2 cylinders and that the branch serves food and beverage and brewery customers. No explicit food-grade designation or exact portable cylinder sizes were published. Email is corporate/general contact; Email source: https://www.generalair.com/contact/.
Official current branch page confirms CO2 availability and states walk-in customers are welcome for cylinder exchanges. Boulder is included as a practical northwest Denver metro option. Food-grade status and exact portable sizes were not explicitly established. Email is corporate/general contact; Email source: https://www.generalair.com/contact/.
Official current branch page explicitly states walk-in customers can pick up or exchange CO2 cylinders and identifies food and beverage and breweries among supported industries. Exact cylinder sizes and food-grade designation were not published. Email is corporate/general contact; Email source: https://www.generalair.com/contact/.
Official current site verifies the Denver warehouse and states it provides high-quality beverage CO2 in 20 lb and 50 lb tanks for bars, restaurants, home brewers, growers, and beverage systems. The site does not clearly establish customer-owned refill versus exchange behavior. Email source: https://denverbeverage.com/contact/.
Hours Mon-Fri 08:00-17:00; Sat 08:00-12:00; Sun Closed
Official current Denver location page verifies this active branch. RMA's current CO2 page offers gas and liquid CO2 for pickup or delivery, and its current food and beverage materials explicitly describe food and beverage grade gases. Portable refill versus exchange behavior and cylinder sizes were not established. Email source: https://rockymountainair.com/contact/.
Hours Mon-Fri 09:00-18:00; Sat 09:00-17:00; Sun 09:00-14:00
Official current site verifies this active Lakewood homebrew shop. A current local listing specifically describes the shop as providing drink-grade CO2. Refill versus exchange behavior and supported cylinder sizes were not sufficiently established from current authoritative evidence.
Official current branch page explicitly lists carbon dioxide among gases available. Portable customer-cylinder refill versus exchange behavior, food-grade status, and supported sizes were not confirmed. Email is corporate/general contact; Email source: https://www.airgas.com/customer-service.
Official current branch page explicitly lists carbon dioxide among gases available at this Henderson retail branch. Portable customer-cylinder refill versus exchange behavior, food-grade status, and supported sizes were not confirmed. Email is corporate/general contact; Email source: https://www.airgas.com/customer-service.
Hours Mon-Fri 07:30-17:00; Sat 08:00-12:00; Sun Closed
Official current Denver branch page explicitly lists CO2, welcomes walk-in customers, and serves food and beverage and brewery customers. The page does not explicitly distinguish same-cylinder refill from exchange at this branch, so moat fields remain conservative. Email is corporate/general contact; Email source: https://www.generalair.com/contact/.
Official current branch page explicitly lists Carbon Dioxide among gases available. Portable customer-cylinder refill versus exchange behavior, food-grade status, and supported sizes were not confirmed. Email is corporate/general contact; Email source: https://stores.lindedirect.com/.
Current local and BBB listings verify this active Denver industrial-gas branch and describe it as supplying compressed gases. Current evidence was insufficient to distinguish portable CO2 refill versus exchange or confirm food-grade status and sizes, so moat fields remain unknown. Email is corporate/general contact; Email source: https://www.mathesongas.com/pdfs/litcenter/Instructions-Gas-Cylinder-Warmer.pdf.