Question: When did the forest fire start in california?
Disambiguated questions and answers: question: When did the forest fire start in California in 2017 named Liberty?
When did the first forest fire over 1000 acres start in California in 2017?
When did the first forest fire over 1000 acres start in California in 2016?
When did the first forest fire in California start in 2015 that exceeded over 1000 acres?
When did the last forest fire start in California that exceeded 1000 acres in 2015?
answer: December 7, 2017
December 2017
April 20, 2017
May 18, 2016
February 6, 2015
December 25, 2015
Natural Questions answer: December 2017 (from the Wikipedia article "2017 California wildfires")