Winter 2026 was one of the most highly anticipated winters in decades at Eaton Canyon. As the first full water year following a major wildfire, what occurs during this particular season will have a profound impact on the trajectory of Eaton Canyon’s recovery.
Through observation, biologists and ecologists have noted discrepancies in how Southern California ecosystems respond to wildfires that occur during different stages of inter-decadal drought and flooding. If the first water year following a wildfire is hot and dry, native shrubs can fail to regenerate, creating openings quickly exploited by invasive annual grasses. This “type conversion” locks the area into a grass-dominated state that burns more frequently and with greater continuity, increasing future fire risk. Alternatively, if the first water year is cool and moist, native vegetation can re-establish before invasive species gain a foothold. Deep-rooted shrubs and resprouting chaparral species rely on early moisture to rebuild carbohydrate reserves and anchor soils. Moderate storm intensity promotes infiltration rather than runoff, reducing erosion. When temperatures remain seasonable, evapotranspiration stays manageable, allowing seedlings to survive long enough to develop root systems.
However, the 2026 winter was neither of these scenarios. Instead, it was a record-hot year with well-above-average precipitation. When comparing winter temperatures with water-year-to-date rainfall, 2026 stands in a league of its own for heat and precipitation. Its closest contender, 1980, was three degrees cooler and 10 inches wetter. Another year, 2015, saw similar temperatures but just half the observed precipitation.
Every other winter that saw similar rainfall as 2026 was, on average, at least 4 degrees cooler.
One of the most significant issues has been the frequency of 80°F+ afternoons during the season. The 2026 winter witnessed a record-breaking 28 afternoons above that threshold, beating the previous record of 25 such afternoons set in 2018. Even worse, these warm days have been evenly spread throughout the entire season, preventing any prolonged cool, wet period. Of the four storm series that impacted the park during the winter, none of them lasted more than 2 weeks before hot, dry weather returned.
The season ended with a bang, with the first-ever extreme heat day during the winter season on February 27, 2026 when high temperatures reached 95°F.
Now, a major heatwave is bearing down on the canyon in what is likely to be the hottest March on record in the area.
