Rated a Very High Fire Hazard Severity Zone by CAL FIRE, since 1980 there have been 19 wildfires within three miles of Harmony Grove. Eleven homes and 25 structures in Harmony Grove were completely destroyed in 2014’s Cocos Fire.
On July 25, 2018, the San Diego Board of Supervisors voted to amend the county General Plan and change zoning in Harmony Grove and Eden Valley for two housing developments, Harmony Grove Village South and Valiano.
Combined these projects will bring 779 additional homes to the region. When the local town council and county planning group evaluated both projects, they unanimously voted against the recommendation of the projects, with fire danger and damage to the community's rural character as the chief problems.