Live oaks meeting over a wet New Orleans residential street at dusk, storm light on the pavement.

Orleans Parish · twenty years after Katrina

The canopy never came back.

30%18.5%

Katrina took an estimated 200,000 trees. They didn’t grow back. New Orleans is hotter, air quality is worse, and we’re weaker when storms approach.

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Pre-Katrina canopy: nearly 30% of the city in 2005 (City of New Orleans). Today: 18.5% (SOUL satellite analysis, two vendors; City of New Orleans). Katrina loss estimate: upwards of 200,000 trees (City of New Orleans; SOUL).

The drop

Katrina tore a hole in the air-conditioning of this city.

Wind and flood took live oaks, pecans, and the street trees on the neutral ground. Parkway Partners put the loss above 100,000 trees at the time. The city’s later figure is 200,000-plus. That is the range. Either number is a hole New Orleans has not filled.

A U.S. Forest Service / Nowak study found tree-and-shrub cover fell 9.6 percentage points from 2005 to 2009 — the steepest drop among 20 large U.S. cities. Cover went from 32.9% to 23.3%, a 29% reduction. From 2001 to 2021, Orleans Parish lost about 4,000 acres of tree cover, a 28% decrease since 2000. Hurricane Ida and later storms are expected to cut the percentage further once fully counted.

Loss range: Parkway Partners (100,000-plus at the time) and City of New Orleans / SOUL (200,000-plus). 2005–2009: nola.com reporting the Urban Forestry & Urban Greening study. Acres and Ida caveat: Woodwell figures cited in the SOUL Reforestation Plan. Today: SOUL satellite analysis, two vendors; City of New Orleans. City pre-Katrina figure is “nearly 30%,” which is why the share line below uses 11 points, not the Nowak 32.9.

Canopy cover, citywideBars use only the published figures

2005
Before the water
32.9%
USFS / Nowak
2009
After Katrina
23.3%
Steepest drop of 20 cities
Today
Still not recovered
18.5%
SOUL / City

A New Orleans residential block with almost no mature tree canopy, pale sky over shotgun houses and open pavement.

Why it matters

Shade is not decoration. It is how this city survives the heat, and the week after landfall.

Air & heat

9°F

hotter than nearby rural land — among the worst urban heat islands in the U.S. Some pockets run upwards of 16°F hotter.

After Hurricane Ida, heat — not flooding — was the leading cause of death when the power died and people sat in unshaded, uncooled houses. EPA: shaded surfaces can be 20–45°F cooler than unshaded materials; evapotranspiration can cut peak summer air temps 2–9°F.

Trees also pull ozone, nitrogen dioxide, and particulate matter out of the air you breathe. Historical redlining and income track with a low Tree Equity Score and fewer trees.

Heat island: SOUL plan; ASLA. Ida deaths: ASLA / SMM. Shade temps: EPA heat-island trees page. Equity: Woodwell / SOUL.

Stormwater

21,000

gallons of rainfall a large live oak can intercept in a year.

That is water that does not sheet across asphalt into a clogged catch basin. Parks and Parkways’ public-tree inventory (i-Tree Streets) puts stormwater interception at about $2,085,774 a year, and energy savings at about $1,312,038 a year. Carbon sequestration: about $235,176 a year.

Trees slow rain, open soil for infiltration, and cut debris in the drains. A live oak on a neutral ground is drainage infrastructure with leaves.

21,000 gallons: i-Tree, cited in the SOUL plan. Dollar lines: Parks and Parkways public-tree inventory (i-Tree Streets).

Wind and recovery

Ida

Heat killed after the storm. Shade is the recovery system people actually live inside.

Trees do not stop hurricanes. They lower heat after the storm, intercept rain before it hits pavement, and in groups act as windbreaks that drop wind speed behind the line — taking energy out of wind at the neighborhood scale, not at the coast.

A New Orleans street at dusk after a storm, wet pavement and a break of gold light under remaining oaks.

Windbreaks and post-storm heat: SOUL plan. Ida heat deaths: ASLA / SMM. Carbon line $235,176/yr from the same public inventory.

Honesty note on air-quality dollars: the same public inventory’s i-Tree air-quality line was slightly negative (-$24,977) because of how the model scores biogenic emissions. Heat, stormwater, and energy are the stronger local numbers, which is why they lead.

An unshaded New Orleans intersection in harsh midday sun, brick corner store and almost no mature trees.

A centuries-old live oak trunk and spreading limbs over a New Orleans brick sidewalk.

Who has shade

Some neighborhoods sit near 1% canopy. The Garden District approaches 30%.

That is not a taste difference. Historical redlining and income track with a low Tree Equity Score and fewer trees. More than half of 72 neighborhoods are under the 10% floor SOUL and Spackman Mossop Michaels set for 2040. This finder will not invent a percentage for your block.

NOCTURNL target neighborhoods

$8 million USDA Urban and Community Forestry grant, 2024–2028. These are the named planting zones. No per-neighborhood percentages on these cards, because the public sources do not give us honest ones.

Carrollton corridor