Car shipping company generally increases the price of shipping a car when the diesel fuel prices raises. To save your money it is better to ship your car when you finding decrease in the fuel price.
Commonly fuel prices increases in summer this is due to the increase of holiday travel by more people. Of course this matter devours more fuel, so fuel costs increase across the US. Since fuel price increases likewise there is also seem to be rise in cost of car shipping.
The prices may rises depends on the snowfall that start south for the winter and north for the summer. So if you are shipping your car south in the fall season or transporting it north in the spring, prices may be little bit higher.
Since the price varies by time of year, the best time to transport your vehicle is when it is most suitable for you.