My centennial grows like crazy.. as does my northern brewer.
I'd recommend covering up your rows with plastic.. instant greenhouse! It'll give you a jump start on our short growing season up here... in fact, I'm going to go "plastic" my hops bed today.. Give them a little extra warmth.
All the hops are up and I decided to till up the grass between the rows this morning. Then I planted with winter rye which will out compete the grass and act as a living mulch/green manure.
So after I did that, I tilled up a large section(about 45x45) of my main garden and planted with barley. I used a 6 row variety called "Lacey" I used this variety because that is what was available without having to drive far. This variety is a malting variety.
Now in a few months I will have rye and malting barley.....hmmmmmmm. Rye ipa? And my chinook and nugget crowns from Great Lakes should produce this year. Might need to take a week of vacation towards the end of summer to malt some barley, pick some hops and do a 100% homegrown ale!