A Very Strong El Niño Is Forecast: Is Your Soil Ready for a Wetter Mid-Atlantic Fall and Winter?

Fall is a natural time to take stock of the yard. This year, there’s an extra reason to look closely at what’s happening below the surface. Forecasters expect one of the strongest El Niño events on record, and that shift in the Pacific could tilt the mid-Atlantic toward a wetter season.

Healthy soil soaks up rain and keeps plant roots breathing. Slow-draining soil can stay soggy for days, and waterlogged soil stresses trees, shrubs, and lawns. The good news is you can assess your yard in a single afternoon and fix most problems with simple, low-cost steps.

How the El Niño Winter Forecast Could Affect the Mid-Atlantic

Before you grab a shovel, it helps to separate what forecasters know from what they expect. Here’s how the latest El Niño winter forecast breaks down for the region.

What NOAA Has Confirmed

El Niño is more than a prediction this year. In September 2026, NOAA’s Climate Prediction Center confirmed El Niño conditions in the tropical Pacific and issued an El Niño Advisory.

The event was also gaining strength. Forecasters put the odds above 90% that it would intensify into a very powerful event during the fall and winter. They also saw a 75% chance of a record-breaking event between October and December, stronger than any El Niño since 1950.

What the Forecast Favors

Strong El Niño events tend to steer more storms along the East Coast, which tilts the mid-Atlantic toward wetter conditions.

This winter may follow that pattern. The U.S. Geological Survey expects more frequent coastal storms and nor’easters, which raises the odds of ponding water and saturated soils along the Atlantic seaboard. On the bright side, forecasters also expect fewer tropical storms this fall, which lowers the chance of hurricane flooding.

What the Forecast Can’t Guarantee

A forecast shifts the odds, but it doesn’t set the outcome. NOAA notes that impacts are more likely with an event this strong, but they’re not guaranteed.

Local history shows both sides. Since 1950, strong El Niño winters in Washington, D.C., and Baltimore have averaged warmer and wetter than normal, though four of seven brought well-above-normal snowfall while three brought almost none.

Some areas are still catching up on rain, too. In mid-September 2026, about one-quarter of the region covering eastern and central Virginia, northeast North Carolina and Maryland’s lower Eastern Shore remained in drought. The National Weather Service saw no clear rain signal there through Nov. 30, though conditions were likely to keep improving.

That mix is a helpful reminder that good drainage and good moisture retention work hand in hand.

How to Test Soil Drainage With a Perc Test

A simple drainage check can show whether your yard is ready for a wetter season. Focus first on the places where water already collects — low lawn areas, compacted paths, downspout outlets and garden beds where plants have struggled.

A percolation test, or perc test, measures how fast water moves down through the soil. All you need is a shovel, a hose, and a ruler.

Dig down about 2 feet deep and make the hole around 6 inches wide. Fill it with water, let it drain completely, and then refill it. Use a measuring tape to measure how much the water level drops in 30 minutes. Divide 30 by that drop to find the absorption rate.

Slower drainage points to compaction, heavy clay or a low-lying area where runoff collects. Soil that drains steadily is usually ready for normal rainfall. Soil that stays full for a long time may need help before repeated winter storms arrive.

How to Read Your Results

A steady drop of up to 3 inches per hour usually indicates the soil can support common garden plants, while very slow movement suggests compaction, heavy clay, or a low spot where water may linger after winter rain. If the hole loses less than 1 inch per hour, plan to improve drainage or choose plants that can handle wetter roots.

Want a quicker way to test soil drainage before planting a tree or shrub? Many gardeners use a simpler perc test. They dig an 18-inch hole, fill it with water, let it drain, and fill it again.

According to the garden experts at Stadler Nurseries, “The water should drain fairly quickly, within an hour or so. If it doesn’t, there is a drainage problem.” Stadler also notes that compacted soil from construction equipment is a common hidden cause of waterlogged soil.

How to Improve Soil Drainage Before It Rains

A slow result still leaves plenty of time to act this season. If you’re wondering how to improve soil drainage, these steps work best when you start in the fall, before the ground stays wet for weeks at a time.

Mix Compost Into the Soil

Compost is one of the most effective fixes for slow-draining soil. It helps tiny soil particles bind into small clumps, creating space for air and water to move through. Spread a few inches over the problem area and work it into the topsoil.

Patience pays off here. Extension horticulturists note that improving compacted soil with compost is a steady process, not a quick fix, so starting this fall gives it a head start in spring.

Break Up Compacted Soil

Foot traffic, mowers, and heavy equipment compress soil pores. Core aeration pulls small plugs from the lawn and creates pathways for water to move downward. Follow it with a light layer of compost for even better results.

Try to stay off soggy ground whenever possible. Walking on wet soil packs it right back down and undoes your progress.

Loosen Heavy Soil With Perlite

Perlite can help loosen heavy soil in smaller garden beds or planting areas. Its lightweight, porous texture creates more air pockets, helping water move through the ground instead of sitting around plant roots. Mix it into the top layer of soil with compost to improve soil structure.

Redirect Runoff With a Rain Garden

Sometimes the issue is the volume of water reaching the soil, not the soil itself. Downspouts and driveways can send roof runoff straight into low spots. Rain gardens give that water a planned place to soak in.

Size plays a big role in success. A rain garden typically works best when it drains about 10% to 20% of the roof or paved area into it. For example, 500 square feet of roof feeding one downspout pairs well with a 50- to 100-square-foot garden.

Place it uphill of soggy areas rather than inside them. That way, it catches water before it reaches the problem spot.

Install a French Drain

A French drain may help if water consistently collects in the same low-lying area or moves toward a foundation, patio, or walkway. This system uses a gravel-filled trench and a perforated pipe to redirect excess water away from the problem spot.

It is a bigger project than adding compost or planting moisture-tolerant species, but it can be useful when runoff needs a clear path out of the yard.

Plant for Wet Spots

Some areas will always stay a little damp, and that’s okay. Choosing plants that thrive in waterlogged soil turns a problem patch into a lush, low-maintenance corner. Good options for wet sites include:

• Bald cypress
• Black gum
• River birch
• Swamp white oak
• Sweetbay magnolia
• Buttonbush

These plants work best alongside drainage fixes, not in place of them. A healthy mix of both gives your yard the most flexibility in a wet winter.

How to Prepare Your Yard for Whatever Winter Brings

A very strong El Niño raises the odds of a wet mid-Atlantic fall and winter, but no forecast is a promise. That’s why soil prep is such a smart move. It pays off in wet years and dry ones alike. Well-draining soil lets excess water move through during storms and still holds moisture when rain is scarce.

Set aside an afternoon this fall to learn how to test soil drainage in a few key spots. With a quick perc test and a clear plan to improve soil drainage, your yard can stay healthy and resilient no matter what the El Niño winter forecast brings.