Question: When did the california wildfires of 2017 start?
Disambiguated questions and answers: question: When did the first large california wildfire of 2017 start?
When did the October Northern california wildfires of 2017 start?
When did the December Southern california wildfires of 2017 start?
answer: April 20, 2017
October 8, 2017
December 4, 2017
Natural Questions answer: October 2017 (from the Wikipedia article "2017 California wildfires")