Apparently you didn't harden off the tomato plants before putting out the first time, or didn't water then adequately. Second time around It appears you didn't harden them off again. Protecting them from the wind is another reason to harden them off for about a week to strengthen the stems to handle it.

Just keep growing. White leaves sounds like sunscald (especially if you started the plants under lights). So, kevin's possibly right about the hardening off. What kind of fertilizer are you using, and how often? How are you applying it? If it's cold, foliar sprays aren't a great idea, I've found (they're a great idea when the temperatures are a lot warmer—but not while the sun is out). What varieties are you growing? Are they in the ground or containers? What did you give them last year that you didn't give them this year, if anything? Did you start the plants the same way last year?

Not all cool-season varieties are adapted to the same areas.

I wonder if the OSU (Oregon State University) varieties would be well-adapted for your area (like Oroma and Saucy). However, if it's really sunny, I don't know that that would be the best idea. My area is sunny, and Oroma does better in the shade here.

It's also possible the plants are just too cold to put on a lot of growth. So, you might just have to wait until it warms up, or give them something like black plastic to warm the soil.

No, not thrips, not powdery mildew. I think it's just too cold this summer for any growth. We'll see what June brings, but so far they're saying that it's not going to be much warmer than May here (mid fifties to sixties, not much of a summer)

That's no fun. Are those the high or the low temperatures for the day?

Mid fifties to sixties during the day, fifties at night. I covered them with some transparent plastic sheeting to protect them from the wind. They look a little better but are not putting out any new leaves.