Cauliflower likes cool weather and lots of water. I set mine out while young and small about April 13th for the spring crop and about July 15th for the fall crop. They grow very well here.

Concur with Wayne. Cauliflower will do well across most of the US. The major concern is timing. It need a cool moist climate tp properly head. I grow cauliflower in central Georgia both spring and fall. I have to carefully select varieties, especially for spring. I have to harvest spring plantings before June and transplant fall Varieties in September. Fall harvest for me is Thanksgiving to Christmas, You are in a much cooler climate so I expect you would move your fall planting into late July or August. My major advice is to choose your varieties carefully and then work on the timing.

the thing is once the plants are established they grow fine if planted up to aug 15th. but i can't get the transplants to grow. i tried inside in a cooler room but the rays from the sun in the garden windo burned them.

yeah the east end of long island had a great cauliflower crop probably because its always cooler out there and theres always the sea breeze.

i'm thinking next year of diging an area one foot down and placing the transplants to grow in it with a screen on top.

I just fill a planting tray or pot with a good growing medium ( usually Pro-mix) only nedds to be 2-3 inches deep. plant the seeds about now. place the tey in dappled shade ( under trees in a wooded area) keep moist. after emergence move gradually into more direct sun. I never start any brassica inside. Spring plantings are started in cold frames.

Try direct sowing them right outside. Just keep the soil moist, and they'll be fine.