On Tuesday, the Election Commission announced that the state will vote on April 13 and that counting will be held on May 13. Four other states including Kerala and West Bengal are voting in April and May, and the results for all five states will be declared together.
Mr Karunanidhi says the gap of a month between voting and counting is inexplicable.
The BJP in Tamil Nadu has also said the decision to hold elections on the eve of the Tamil New Year will impede upon festivities in the state.