I'm going to try and encourage you to start the plants inside and keep them inside under artificial light for at least a few weeks. Seedlings can be fragile little things and can be damaged/destroyed very easily. Also, their growth will be greatly enhanced if you can get them more than 12 hours of light a day.
If you plant outside now, I still fear that the plants will start flowering prematurely, then go back to veg, and then go back to flowering. Some strains can reach maturity in 4 weeks or so.