Asked May 03, 2021, 8:06 PM EDT
Wood County Ohio
This is the link to the National Weather Service's page on Frost/Freeze Information for Northern Ohio. The information it gives is for Toledo which is as close as I could find: https://www.weather.gov/cle/frost_freeze
The June date you may have seen is the historic latest freeze for the area in 1972. Also, frost is considered to happen at 36 degrees and a freeze is at 32 degrees, of course. Your average last frost date is May 8. I am writing from central Ohio and I am more comfortable with a mid-May date. You may be as well. I had not seen the information about waiting two weeks, but it does make sense to check the newspaper weather column, the weather app on your phone, or on your computer and look at the ten day forecast. Plan accordingly.
Toledo's average first fall frost date is October 6, and average freeze date is October 16.
Now, as far as testing pH, I would just go for a complete soil test. Franklin County Extension offers one for $11.70. This is the information: https://franklin.osu.edu/program-areas/agriculture-and-natural-resources/soil-testing
Finally, although you didn't ask for one, the University of Maryland has a good fact sheet about starting a home garden: https://marylandgrows.umd.edu/2020/03/30/want-to-start-a-vegetable-garden-heres-how/
Good luck and enjoy!