The 7 AM-to-6 PM polling began on a brisk note but appeared to lose steam as the mercury soared before picking up momentum again in the last hours in 223 seats in the 224- member House for which a total of 2,940 candidates were in the fray.
Election in Periyapatna in Mysore district has been put off to May 28 following the death of the BJP candidate.
Counting of votes will be taken up on May 8.
Prominent candidates included Chief Minister Jagadish Shettar, Leader of Opposition in the Assembly Siddaramaiah, President of Karnataka Pradesh Congress Committee G Parameshwara, former Chief Minister B S Yeddyurappa and JDS state unit President H D Kumaraswamy.
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Authorities had made elaborate security arrangements with 1.35 lakh police personnel on duty in some 52,000 polling booths where about 65,000 electronic voting machines had been installed.
Breakaway parties -- Karnataka Janatha Paksha of Yeddyurappa and BSR Congress formed by former Minister B Sriramulu -- are projected to dent the prospects of BJP, already battered by intra-party fights and allegations of corruption.