Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_22383603_1 (season VARCHAR, finish__incl_championship_ VARCHAR)

### Question ###
What season ended on April 18?

### Accurate SQL ###

SELECT season FROM table_22383603_1 WHERE finish__incl_championship_ = "April 18"