SEATTLE — The cost of fighting this season’s wildfires in Washington, including the largest one in the state’s history, has crossed the $50 million mark. Bolstered by the nearly 400-square-mile wildfire in north-central Washington, this year’s wildfire season has been widespread, with dozens of fires burning at the same time. So far, state estimates put the cost of fire suppression at just over $50 million. Nearly half of that cost comes from the Carlton Complex fire in north-central Washington with a tally of $23.3 million. The next-biggest cost is the Chiwaukum fire in central Washington. Those figures don’t include loss of property and damage to infrastructure. The Carlton fire has burned about 300 homes and heavily damaged the power grid in the scenic Methow Valley.At nearly 400 square miles, the lightning-caused Carlton Complex has eclipsed the 1902 Yacolt Burn, which killed 38 people and consumed about 373 square miles, or 238,920 acres, in Southwest Washington. The Carlton Complex has been blamed for the death of a man who appeared to suffer a heart attack while trying to protect his property.