I highly recommend hopleaf as previously stated. If you're in the mood for good local microbrew beer there are some great options here. Revolution brewing company in bucktown on milwaukee ave at california is outstanding, with very decent food to boot. Half acre brewing company has a small retail store on lincoln south of montrose. No food there, but the beer is fresh out of fermentation and they are my personal favorite local beer, and it is served at hopleaf. Piece brewery and pizza on north at milwaukee ave has very decent pizza and very decent beer as well. That said, to my knowledge none of these places have patios other than hopleaf....but the quality of the beer will more than make up for it. Around the corner from piece on damen there is a fantastic albeit busy taco bar called Big Star that has some very good beer options and a massive patio. Check them out too.
Support local breweries!