Dare I risk tender plants in tunnel yet?

I got a bit carried away this year, okay every year, and I've got loads of peppers, aubergines and tomatoes that really need to be potted on. I've been putting a lot of them out every day and bringing back in at night, but it's getting a bit tedious and I'd really like to get them into the tunnel. I'm about to knock up some pipe hoops on my tunnel beds and I can cover those with fleece, so do you think I'd be safe to start leaving some of this stuff overnight in the tunnel, with the fleece protection as well? I don't want to risk setting stuff back too much, but I kind of wonder what the point is of having the tunnel if I can't put stuff out earlier than I would without the tunnel.

Hard to be sure about current overnight temps - and you'll understand why if you saw my thread about my problems with min/max thermometers

Normal last frost date for my area is early May. Last year I had all tender plants outside by the first week in May. This spring is obviously a little colder than average, but my local forecast shows quite low overnight temps from now until Sunday and then Monday night is supposed to be warmer. The long-term forecast beyond that looks more about rain and wind than low temps. Maybe what I'll do is put some of my spare plants in the tunnel and fleece from Monday on and see how they get on. And invest in a min/max thermometer that actually works.

It's just been snowing here this morning.

 

I recently got a polytunnel, I had tomato and french bean plants coming a treat in there,then over one night ,which was frosty, I lost about 2/3ds  of them,maybe it was a one off, but it seems they dont protect against an unexpected frost.