Key takeaways
- A strong event (80% probability) is likely by fall, with peak intensity hitting in winter 2026–27.
- El Niño splits the country. The Southeast, Gulf Coast, California and the Desert Southwest will trend wetter and nearly the entire country trends warmer, including the Northern Tier and Northeast.
- Wet regions should expect more lawn fungus and lawn mowing. Dry regions must prepare for drought stress and watering. Fall is your key window to act.
A strong El Niño is building for late 2026, and whether it helps your grass or hurts it comes down to your region. In wet areas, it means more lawn fungus and lawn mowing, while in dry ones, more drought stress and watering.
NOAA issued an El Niño Advisory and put the odds of a “very strong” event at greater than 80% by October through December 2026. Forecasters say this could rank among the strongest El Niño events in recorded history by ocean temperature, with the biggest effects felt in fall and winter.`
What is a “Super” El Niño?
El Niño is a climate pattern in which surface water in the central and eastern tropical Pacific becomes warmer than normal. That warming can shift the jet stream and change the weather we usually expect across the United States, especially during the fall and winter.
Cheryl Nelson, meteorologist and CEO of Prepare with Cher in Norfolk, Virginia, explains the mechanics behind El Niño.
“El Niño is the atmosphere’s response to warmer than normal water temperatures in the Pacific Ocean near the equator,” she says. “This ultimately influences weather patterns across North America.”
As for the dramatic nickname?
“One thing worth pointing out is that ‘Super El Niño’ isn’t actually an official NOAA term – it’s something you’ll often see in media headlines,” Nelson clarifies. “NOAA classifies El Niño events based on their strength, using categories like weak, moderate, strong, and very strong.
“Even a very strong El Niño won’t produce textbook impacts in every community,” she says, “but it does increase the likelihood of seeing the weather patterns we typically associate with it.”
When El Niño hits your lawn: A seasonal timeline
El Niño’s lawn effects unfold over the year. Here’s when to expect the changes:
How El Niño affects your lawn (by region)
Before diving into regional specifics, it’s important to remember that macro-forecasts tell only half the story.
“When NOAA says an area has an increased chance of being wetter or drier than average, they’re describing the odds over an entire period of time or season – not predicting what will happen in someone’s backyard on any given day,” Nelson says.
“Things like elevation, proximity to lakes or the ocean, urban development, prevailing winds, and even the slope of your property can all influence how much rain your yard actually receives. It’s not unusual for neighborhoods just a few miles apart to receive very different rainfall totals from the same storm,” she says.
If your region turns wetter
Extra rain and humidity, expected in Southern California, the Desert Southwest, Georgia, South Carolina, Alabama, the North Florida Panhandle, and Alaska, can do a lot of damage to a lawn:
Fungal disease: Brown patch, dollar spot, and pythium blight thrive in warm, wet conditions. Contact and protectant fungicides lose efficacy fast in heavy rain. One inch of rain removes roughly 50% of the residue. You’ll need to reapply sooner or switch to longer-lasting fungicides during prolonged wet spells.
More weeds: A wetter winter and spring germinate more weed seeds, so expect a heavier weed year. A pre-emergent and a thick, well-fed lawn are your best defense.
