Best temperatures for tomato seed germination range from 70 to 95 degrees F, with 85 degrees F being optimum. There should be no problem starting them outdoors.
I believe you have a longer growing season than us folks in MN, so your seedlings should be of good size by the time you need to bring them indoors.
You could also pre-sprout them in a moist, not wet paper towel, for a day or two, in a warm spot. Carefully monitor the seeds until the tiny roots just start showing, and then plant outdoors. Keep the soil around the plants moist (too wet and you risk rotting the seeds). I use my pointy finger to monitor soil moisture.
The best of luck,
Joe
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