Keep in mind that the RMA establishes an earliest planting date for crops insured under the individual MPCI plans of insurance (Yield Protection & Revenue Protection) by county and state. This does not apply to the Group Plans of Insurance (GRP & GRIP). If a grower initially plants an insured crop prior to that date, they are forfeiting the replant coverage on the MPCI policy. This would be determined on a unit by unit basis. The same would be true for any Supplemental Replant Coverage they have requested.
This link will take you to the location on RMA's website where you can look up specific crops by state/county/plan of insurance. If you select the specific search criteria and then click on View Report, you can then click on the Dates tab. This is where you will find several dates, including the Earliest Planting Date. Here are some general references, but please verify with the RMA website if there is any question of insurance coverage.
Illinois - Corn (4/6), Soybeans (4/16 - Northern counties) (4/21)
Indinana - Corn (4/6), Soybeans (4/21)
Ohio - Corn (4/6), Soybeans (4/21)
Minnesota - Corn (4/11), Soybeans (4/21), Sugar Beets (4/11), Dry Beans (4/26), Spring Wheat (3/21)
Nebraska - Corn (4/10) (4/15 - Northern Counties), Soybeans (4/25)
As an alternative, ask your Water Street Solutions Crop Insurance Specialist about TWI early freeze coverage.