Question: When did the california wildfires of 2017 start?

Disambiguated questions and answers:
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question: When did the first large california wildfire of 2017 start?
short_answers: April 20, 2017
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question: When did the October Northern california wildfires of 2017 start?
short_answers: October 8, 2017
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question: When did the December Southern california wildfires of 2017 start?
short_answers: December 4, 2017

Long-form answers:
knowledge: content: In terms of property damage, 2017 was the most destructive wildfire season on record in California at the time,[5] surpassed by only the 2018 season,[6][7] with a total of 9,560 fires[2] burning 1,548,429 acres (6,266.27 km2) of land, according to the California Department of Forestry and Fire Protection, including five of the 20 most destructive wildland-urban interface fires in the state's history.
wikipage: 2017 California wildfires
content: Owing to the extreme conditions, shortly after the fires ignited on October 8 and 9, they rapidly grew to become extensive, full-scale incidents spanning from 1,000 acres (400 hectares) to well over 20,000 acres (8,100 ha), each within a single day.
wikipage: October 2017 Northern California wildfires
content: A series of 29 wildfires ignited across Southern California in December 2017. Six of the fires became significant wildfires, and led to widespread evacuations and property losses. The wildfires burned over 307,900 acres (1,246 km2),[4][5][6][7] and caused traffic disruptions, school closures,[8] hazardous air conditions,[9] and power outages;[10] over 230,000 people were forced to evacuate.
wikipage: December 2017 Southern California wildfires
long_answer: In terms of property damage, 2017 was the most destructive wildfire season on record in California at the time surpassed by only the 2018 season, with a total of 9,560 fires burning 1,548,429 acres (6,266.27 km2) of land. The first wildfires that broke out were on April 20, 2017. On October 8, 2017, more fires broke out and rapidly grew to become extensive, full-scale incidents spanning from 1,000 acres to well over 20,000 acres, each within a single day. The year concluded with fires starting on December 4, 2017, with a series of 29 wildfires ignited across Southern California, six of which became significant wildfires, and led to widespread evacuations and property losses.
knowledge: content: In terms of property damage, 2017 was the most destructive wildfire season on record in California at the time,[5] surpassed by only the 2018 season,[6][7] with a total of 9,560 fires[2] burning 1,548,429 acres (6,266.27 km2) of land, according to the California Department of Forestry and Fire Protection, including five of the 20 most destructive wildland-urban interface fires in the state's history.[1][8][9] Throughout 2017, the fires destroyed or damaged more than 10,000 structures in the state (destroyed 9,470, damaged 810), a higher tally than the previous nine years combined.
wikipage: 2017 California wildfires
content: The fires burned over 307,900 acres (1,246 km2), and caused traffic disruptions, school closures, hazardous air conditions, and massive power outages. California Governor Jerry Brown declared a state of emergency in Ventura and Los Angeles Counties,[101] and Los Angeles Mayor Eric Garcetti declared a state of emergency for the city.
wikipage: 2017 California wildfires
content: In addition, the fires have destroyed an estimated 8,900+ structures, and killed at least 44 people.
wikipage: 2017 California wildfires
long_answer: Throughout 2017, there were a total of 9,560 wildfires in California that destroyed or damaged more than 10,000 structures. The first large wildfire of the year started on April 20, 2017. The October Northern California wildfires, which destroyed more than 8,900 structures, started on October 8, 2017. The December Southern California wildfires, for which a state of emergency was declared by the California governor and which burned over 307,900 acres, started on December 4, 2017.