Depending on the yeast you used the cool temps may have made your FG a bit lower. Was your OG also a bit on the high side? What yeast did you use? A starter is also a good idea on bigger beers like you said.
Kelpie Home Brewery, Lafayette Colorado
Primary: Creek Dog Stout x2, Two Dogs IPA, Grinning Kelpie Wheat
Secondary: empty :(
In Bottles: Belgian Wheat