Almost all crucifers do well in cooler temps , or even short season climates; also, they can be grown in partial shade.
Consider all lettuces, most greens, spinach, peas, beans, and root crops
Also, the use of black plastic will heat up the soil and give you a 10 degree jump, or even use row covers to extend the season longer.
Have you heard of a "Cold Frame", to germinate seeds or extend growing season ?
Well, if you can build a cold frame, then add a hot manure (ie: horse, or chicken) below the base of the cold frame, it will give off heat as the manure oxidizes.
The further below and deeper to the base of the cold frame,.. the less fragrance !
(see below - a forgotten method used by our ancestors)
" How to Use Manure to Turn a Cold Frame into a Hotbed "
http://www.groworganic.com/blogs/articles/use-manure-to-turn-a-cold-frame-into-a-hotbed
Yep looking at cold season crops like that. Going to build a hoop greenhouse over our garden boxes. Have to watch it since our official growing season is only 81 days. (Heavy snow in summer not uncommon). Working to start plants in 5he house first. But nothin* like our year round garden in kalifornia