It had started as a burn of hazardous logs in the winter, then smoldered for months before resurfacing as a wildfire, according to a federal review.

Source: https://www.abqjournal.com/2588273/hermits-peak-calf-canyon-wildfire-new-mexico-one-year-later-devastation-lingers.html

They smoldered for a few days, and when the wind picked up the still-hot embers ignited, and 1,559 acres went up in flames in what became the 403 fire.

Source: https://gazette.com/news/colorado-springs-fire-official-top-3-causes-of-wildfires-are-men-women-and-children/article_52ee01d4-e03c-11ed-a008-9f06beba6cfb.html