If you're flying into Boulder Municipal Airport and need a midsize rental, typical rates across all five major brands at WBU average $60 per day — 18% above the network-wide average for this class. That puts WBU in a more expensive market than usual for midsize rentals.

Midsize class vehicles at this airport seat 5 passengers comfortably, hold roughly 3 standard suitcases in the trunk, and average around 32 mpg combined — useful context if your trip involves long highway stretches or just a few airport-to-hotel hops. Families of three or four who need a bit more legroom without jumping to a full-size. Brand-specific model assignments rotate based on lot inventory, so book by class rather than by exact model and confirm what's actually available when you arrive at the counter.

The tables below show what each of the five major rental companies typically quotes at WBU for the Midsize class — daily, weekly, and effective monthly rates. Use the cheapest column as your floor when you negotiate or compare against quotes from third-party booking sites.

Brand-by-brand midsize rates at WBU

Brand	Daily	Weekly	Monthly est.	vs cheapest
Enterprise	$43	$267	$1,032	cheapest	See Enterprise at WBU →
National	$57	$353	$1,368	+$14	See National at WBU →
Budget	$58	$360	$1,392	+$15	See Budget at WBU →
Avis	$69	$428	$1,656	+$26	See Avis at WBU →
Hertz	$72	$446	$1,728	+$29	See Hertz at WBU →

Rates are Concourse Guide composite estimates based on recent quote sampling and are intended for relative comparison — verify current pricing on the brand's site before booking.

Is the Midsize class right for your trip to Boulder?

Midsize rentals make sense at WBU when your itinerary matches the class's strengths. Families of three or four who need a bit more legroom without jumping to a full-size. If you're traveling solo or as a couple with carry-on luggage, an economy or midsize car will save you $10–25 per day versus the midsize class — check our full WBU rental comparison for the math. If you're traveling with a group of 5+ or hauling sports gear, ski equipment, or oversized luggage, the midsize class is usually worth the upcharge over a smaller vehicle that forces a second rental.

Cross-shop the alternatives before locking in: Boulder renters frequently end up choosing between SUV and minivan, or between midsize and luxury, depending on the trip. Each class has a different sweet spot at WBU:

Economy at WBU — from $35/day · Solo travelers and couples on short trips who want the lowest possible daily rate.
SUV at WBU — from $68/day · Ski trips, beach weeks, and anyone hauling sports gear or strollers.
Minivan at WBU — from $78/day · Group travel, multi-generational trips, and families with three or more kids.
Luxury at WBU — from $99/day · Business travelers, special occasions, and anyone who wants a quieter, more powerful highway car.
Van / Cargo at WBU — from $146/day · Sports teams, big group transfers, moves, and tradespeople hauling tools or equipment.

Pickup tips for midsize renters at WBU

Three things to know before you commit to a midsize at Boulder Municipal Airport. First, ask the counter agent which specific model is on the lot — published class definitions vary, and at busier airports like WBU the agent will often offer a free upgrade to clear inventory. Second, inspect the vehicle thoroughly before leaving the lot. Photograph all four corners, the wheels, the windshield, and the interior; rental damage disputes are settled by who has the better evidence.

Third, if you're picking up after midnight, confirm in advance that the counter will hold your reservation — some WBU rental locations release no-shows as early as 30 minutes after your scheduled pickup, especially for higher-class vehicles like midsize that get rebooked quickly. The cheapest brand here right now (Enterprise at $43/day) may not be the best for late-night arrivals; National and Hertz typically have the most reliable after-hours staffing at major airports.