My garden has lain fallow for at least two years (I moved tomatoes in a sunnier spot) so I think it's okay to plant potoes where the tomatoes grew before. But I don't know whren I can plant the potatoes. Hoosiers: when to plant???
Not a hoosier, but based on the average last frost date for Indianapolis of May 9. I would suggest between March 20 - April 10. Northern Indianna up to a week later (Gary), or a week earlier in southern Indianna (Evansville).