Hurricane evacuation
When the storm spins up, here's how Houston leaves.
The five major evacuation corridors out of Harris County — including contraflow timing, ZIP-zone guidance, and the back routes locals quietly take when I-45 north is at a crawl.
The five Houston evacuation corridors
Harris County's evacuation plan funnels traffic out of the coastal flood zones along five primary corridors. In a Category 3 or higher landfall scenario, the Texas Department of Transportation can open contraflow on the inbound lanes of I-45 North, I-10 West, and US-290 — turning every lane northbound or westbound. Here's how each route works, and when it makes sense.
I-45 North — toward Dallas
The primary evacuation route for the Galveston and Bay Area Zones. Contraflow opens between Beltway 8 and Huntsville. Traffic backups during a coastal evacuation can stretch from Conroe to The Woodlands — leave 12 to 24 hours before a Category 2+ landfall to avoid them. Worst-case Houston-to-Dallas travel time in TxDOT modeling: 14 hours.
I-10 West — toward San Antonio
The Katy Freeway is the evacuation route for the west side, inner Loop, and most of the medical center. Contraflow opens from Katy to Sealy when a major storm threatens. Locals know to break off onto FM 1093 / Westheimer or US-90A if I-10 stops moving — both run roughly parallel and lose traffic well before Brookshire.
US-290 Northwest — toward Austin
Northwest Houston, Cypress, and Jersey Village evacuate up 290 toward Hempstead, Brenham, and Austin. Contraflow can open between 1960 and the Brenham split. The 290 expansion has eased the pinch points around Telge Road and Mason Road, but expect crawl conditions through Waller.
US-59 / I-69 North — toward Lufkin
The Eastex Freeway is the relief valve for the east side, Kingwood, and Humble. No formal contraflow plan — TxDOT relies on the Grand Parkway and Beltway 8 to keep this corridor moving. Best used early; once I-45 backs up, every evacuee with a smartphone reroutes here.
TX-249 / Tomball Tollway — toward Magnolia and Navasota
The quiet escape. From inside the Loop, head up the Tomball Tollway through Tomball into Magnolia, then catch SH-105 west to Navasota. It's the route Houstonians take when the freeways are gridlocked and they want to be in a small town with a working gas pump.
Before you go
Fuel up, fill water, and tell someone outside Texas your route.
Evacuations move slow. TxDOT modeling puts the worst-case Houston-to-Dallas trip at 14 hours during a coastal hurricane — and every gas station inside the Loop runs dry within four hours of an evacuation order.
Top off fuel the day before any landfall warning, fill water containers, pack a 48-hour go-bag, and let one person outside the state know your route and destination. Houston OEM recommends leaving in daylight when possible.
ZIP-zone evacuation
Harris County uses a tiered evacuation by ZIP code. Zone A — coastal Galveston Bay, Clear Lake, and the Ship Channel flats — evacuates first, typically 48 to 72 hours before landfall. Zone B (inland coastal), Zone C (inner Loop south), and Zone D (north Harris County) follow as the storm gets closer. Inland Houston is rarely told to evacuate at all — the strategy is to clear the coast and leave the rest of the metro in place.
Find your zone at ReadyHarris.org — the county publishes a ZIP lookup that returns your zone and the typical evacuation timing.
Contraflow lanes
TxDOT can open contraflow on the inbound lanes of I-45 North, I-10 West, and US-290 — converting every lane in both directions to outbound flow. It typically opens 12 to 18 hours before a Category 3 or higher landfall, with the governor's authorization. When contraflow is open, the inbound side is closed at gates between the Loop and the next major exit; all entrances downstream become exit-only. Don't try to enter or cross contraflow lanes — DPS troopers stage at every overpass.