Brassicas germinate easily around 80°F so there should be no problem starting them now. In my experience, White Cabbage butterflies are a problem until frost, so they will need to be protected. During the heat of the summer like now for this area, Cabbage moths and Harlequin stinkbugs will also continue to be a threat. Slugs will also strip a tiny seedling.
You may want to start them indoors under lights until they are a little bigger, or start them in small containers or cell trays outdoors and use some kind insect-excluding protection. Right now, I’m thinking about using an inexpensive dollar-store pop-up laundry hamper for my batch of fall brassica starts....
But if sowing directly in the ground, make a hoop tunnel over the bed. I have UV protected insect screen for low tunnels that can be used over and over, but I have also found tulle can be an useful option and will last one season. You can buy a large swathe (bolt) of it at a fabric store or on line like amazon.
BTW Red Russian Kale will get tall as mentioned previously, and they can become difficult to cover/protect. If this is a concern, you (she) may also want to consider more compact varieties of kale. In your area, they may survive longer into winter if protected with garden fleece/floating cover and later with plastic over the fleece. So even though the insects won’t be as much of a problem after frost, you may want to think about building a sturdier support structure (not collapse from rain or snow) and cover them.
They will be fine until mid-20’s to mid-teens without protection, however, and have overwintered in my Zone 6B garden which can get down to negative single digits — once leaves are freeze killed, no harvestable leaves until they start growing back. In the cooler season in the fall and spring, they are susceptible to the waxy grey cabbage aphids so watch out for those.
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