i would try a small green house....the sun is free..... I was looking on ebay and green houses are pretty cheap....put some lights to get you vegged for 30 days and then a small little office heater and let the sun start them on flower.....you could get two grows in before you outdoor is ready and also you could start you outdoor in the greenhouse and then move them out....you could have a mother plant and get all your clones for outdoor also.

good luck