You can always hope but the odds aren't in your favor IME. Better cooling effect is achieved by erecting a heavy shade shelter 3-4 feet over the bed that will allow the soil to cool somewhat. Even then you need a good 20 degrees of cooling and that can be almost impossible to get.

But if you can make it work please be sure to let us know.

Dave

I will report back with my results.

I may throw a shade over them tonight as well, the heat is supposed to start fading by Friday.

I'll probably harvest a bunch tonight as well, just in case...

Water on the leaves during the heat of the day can cause scorch if not shaded, so be careful. It might be safer to flood the soil under the leaves if that is practical. It's always tricky growing lettuce during the summer as you already know.

Here is a link that might be useful: Alan Chadwick

IME, the water on the leaves during the day causing scorch/burn is an old wives tale...

If possible, i'd run the misters every peak hour for just a few minutes. This way it's cooling without risking stem rot from overwatering.
Also, if you can bang some stakes in to keep some shade cloth (or a sheet, etc) over them, but not on them, it'll help quite a bit.
Good luck!

Mark

I've always found that cold water on the root zone, not the leaves, is most effective. Also that close planting encourages bolting, and giving each plant head space tends to keep it - as well as giving more direct access to the root zone.

Shade if you can...and yes, very hot the next few days.
I plant very thick, especially when the hot weather is coming...though this is a bit early for us...NY/NJ....
My salad beds are shaded 50%. I still may have trouble with the spring mix but i already have a hot summer mix i've been cutting...
I have salad all summer by planting a heat tolerant blend and shade...don't have the water pressure for misting but would if i could. (gravity spring fed)

We will never loose the water/burn/magnifier myth...
I've had a few mid day showers this spring with the sun shinning...no harm