Iowa Bicycle Laws

Required under age

No statewide age requirement

Applies to passengers

—

Standard

—

Penalty

Iowa has no statewide bicycle-helmet law and Iowa Code § 321.236(13) expressly preempts cities and counties from enacting local helmet ordinances for adult cyclists. Helmets remain unregulated for adults; some youth cycling programs require CPSC-certified helmets as a condition of participation.

Statute

—

See our find your helmet size and kids bike sizing guide.

Statewide rule

Allowed with conditions

Notes

Iowa Code § 321.234 lets bicyclists ride on sidewalks unless prohibited by local ordinance or official sign. Riders must yield the right-of-way to pedestrians and give an audible signal before overtaking. Des Moines and Iowa City prohibit sidewalk cycling in their downtown commercial districts.

Statute

¹

See our commuter bike sizing guide and bike fitting guide.

Applies to bicycles

No

Separate cycling DUI statute

No

BAC limit

—

Penalty

Iowa's OWI statute (Iowa Code § 321J.2) applies only to operators of a 'motor vehicle,' and Iowa Code § 321.1(42) defines motor vehicle to exclude bicycles. Cyclists impaired in public may still face public-intoxication charges under § 123.46, but the OWI penalties - including a 180-day licence revocation - do not attach to bicycle operation.

Statute

¹²

— Not yet researched.

Front light required

Yes

Front spec

White lamp on the front, visible from a distance of at least 300 feet.

Rear requirement

Rear reflector or light

Rear spec

Red reflector on the rear of a type approved by the Iowa Department of Transportation, visible from a distance of 300 feet to the rear when directly in front of lawful upper-beam headlamps. A red rear lamp visible from 300 feet may be used in lieu of the reflector.

Side reflectors

No

Pedal reflectors

No

When required

Darkness

Statute

¹

See our bike lights that meet the law and winter and low-light cycling setup.

— Not yet researched.

Two abreast allowed

Yes

Conditions

May not ride more than two abreast except on paths or parts of roadways set aside for the exclusive use of bicycles. UVC §11-1205 derivative.

Statute

¹

Rule

—

Statute

—

— Not yet researched.

Bicycle registration required

No

Operator license required

No

Interstates

Prohibited

Notes

Bicycles are prohibited on all Interstate highways in Iowa (I-29, I-35, I-74, I-80, I-380, I-680) under Iowa DOT policy. Conventional US routes and state highways - including the cross-state RAGBRAI corridors - are open by default.