Choosing your moving date
Both cities get heavy monsoon rain, roughly June to September, and low-lying streets in each can waterlog for a while. Durga Puja in the autumn affects many Kolkata roads, and Chhath Puja, a few weeks later, makes crews scarce in Bihar. November to February, outside the festival days, is usually the easiest window.
Because the route is moderate in length, the date is shaped more by weather and festivals than by distance.
Leaving Patna
Tell the mover whether you're in Patna City's narrow lanes or a newer colony, so the right vehicle and crew are planned. List heavy almirahs, trunks and wooden furniture when you ask for a quote.
If you're moving into an older Kolkata building, decide early which large pieces can manage steep stairs, and dismantle or pass on the rest.
Through Jharkhand and Bengal
The usual road heads south from Patna to join NH 19, the Grand Trunk route, then runs east through Dhanbad, Asansol and Durgapur into Kolkata. The approach into Kolkata, with its river crossings and dense traffic, is usually the slowest part.
Ask whether the truck is dedicated to your goods or shared, and get the planned arrival time in writing.
Kolkata buildings and lanes
Kolkata's older buildings often have steep staircases and no lift, and lanes that can't take a full-size truck. Send the mover photos of the approach and the stairs before loading day, so the right vehicle and enough people come.
Newer towers in Salt Lake, New Town and along the eastern bypass have lifts and building offices with move-in rules. Ask about notice and lift slots before fixing the date.
Settling into Kolkata
Kolkata's climate is humid, with a heavy monsoon and mild winters. Unpack and air clothes and books early, keep silica gel in closed boxes and keep things off the floor during heavy rain.
Bengali is the main language, and Hindi is widely understood. Many people from Bihar live and work in Kolkata, so familiar food and festivals are easy to find.
Small moves and students
Many moves on this route are small: a student or young professional with a few cartons and a two-wheeler. Book a few-items move rather than a full-house quote, and list exactly what's moving.
Two-wheelers should be wrapped, photographed and listed separately on the quote with a condition note at pickup.