A tip for Great Lakes gardeners
If you can't check your soil temperature, and are wondering when is a good time to plant certain vegetables, you can check the surface temperature of the lake nearest to you.
My father-in-law (bless his soul) would wait until Lake Erie was 50F before planting his field corn. I try to wait until 55F before planting tomatoes and peppers. This is not a predictor of frost, but some things just won't grow until the ground is warm enough.
As you can see in the link, Lake Erie is only about 40 now.
Here is a link that might be useful: Surface temperatures