Should the plants go outdoors now?

Hello Tomatoheads -
I started seeds indoors in late March and grew them with care under grow lights with good air circulation - no damping off - YAY!! We've had an inspiring and unusual stretch of warm weather the past couple of weeks, in which I gradually hardened them off; they've spent the past few days out on the deck 24/7, and they are looking good to this proud Mater Ma.

Now that the weekend is upon us and I'm ready to put them out in the real dirt...we are heading back to a stretch of typical springlike Pacific Northwest weather. Daytime temps mid to low 60s or high 50s, with some nightime temps down into the 40s
Their garden spot gets full sun, is on the SW side of my house with lots of reflection from the building, and I've had black plastic over the soil for about 10 days, should be nice and warm down below if not in the air.

The varieties I have are Stupice, Siletz and Grandma's Pick. Two of them are supposedly bred for cooler temps. Am I stupid to put them out this weekend, should I just haul them back inside and keep under lights until the weather warms up again? If I bring them indoors again, do they have to be re-hardened later?

Thinking I already know the answer to this question, thanks in advance for sharing your knowledge and any tips you may have for us!
rt