Another motorcyclist has died on the state's roads, adding to the spike in the number of deaths so far this year.

The motorcyclist died just after midday after a crash in Tolmie, near Mansfield in the state's north-east.

It comes the day after two motorcyclists died in separate crashes on Melbourne's roads. There has been a total of 17 motorcyclist deaths on Victoria's roads this year.

Vicroads said Mansfield-Whitfield Road between Barwite Road and Old Tolmie Road has been closed because of the crash.

It is not yet known how the death happened.