In 40 days, the BJP will cover all the 42 Lok Sabha constituencies of the state where the party has set a target to win 22 seats in the general election due next year.
The first "rath yatra" will start on Friday from Cooch Behar in presence of party president Amit Shah. Modi's rally will be held in Siliguri when the march reaches there.
Apart from the December 16 rally, Modi is likely to attend three more rallies during the "rath yatras" but the dates are yet to be finalised, said another senior BJP leader.
Besides the first yatra in north Bengal, Shah will also kickstart the other two -- from Gangasagar in the south on December 9 and the temple town of Tarapith in Birbhum district on December 14.
(With inputs from agencies.)