O'Fallon, MO Sign Regulations: Digital Billboards (2026)
Key Facts
- Minimum display time
- 10 seconds before changing
- Daytime brightness cap
- 5,000 nits maximum
- Nighttime brightness cap
- 300 nits maximum
- Dimming requirement
- Automatic dimmer, dusk to dawn
- Conversion rule
- New digital face can't exceed old face
Summary
O'Fallon allows digital billboards along its regulated highway corridor, but Section 410.170(B)(5) bans flashing, scrolling or animation: the display must hold static for at least ten seconds between changes and change instantly. Brightness is capped at 5,000 nits by day and 300 nits at night, with an automatic dimmer required to make the switch.
Digital Billboards. Billboards having a digital display (digital billboards) are permitted, provided that such billboards do not flash, scroll or employ any form of animation or moving images. Digital billboards must present a static display that changes no more frequently than every ten (10) seconds. ... The digital billboard must not exceed a maximum illumination of five thousand (5,000) nits (candelas per square meter) during daylight hours and a maximum illumination of three hundred (300) nits (candelas per square meter) between dusk and dawn as measured from the sign's face at maximum brightness.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4860992; v58 updated 2026-05-14; through 05-14-2026).
Full Breakdown
A digital billboard is not treated as a prohibited flashing sign as long as it meets these standards: the full image or any portion of it must change through instantaneous re-pixelization rather than a fade, wipe or scroll, and no display may run for less than ten seconds before switching to the next. Brightness is measured at the sign's face at maximum output, capped at 5,000 nits (candelas per square meter) during daylight hours and 300 nits between dusk and dawn, and the sign must carry an automatic dimmer control that makes that daylight-to-night drop happen on its own rather than by manual adjustment.
170(A)(9) lets an existing billboard visible from Interstate 64 or Interstate 70 that lacks a digital face be converted to digital, but only if the new digital face is no larger than the existing sign face and otherwise complies with the Municipal Code. 170(B)(1)-(3).
Violations & Fines
A digital billboard that flashes, scrolls, animates or changes faster than every ten seconds loses its protection as a permitted sign and becomes a prohibited flashing or moving sign under Section 410.130, subject to immediate removal by City staff without notice. Any other sign-code violation is enforced under Section 410.190: a written notice giving five days to correct an installed sign, and on conviction a fine of up to $500.00, up to ninety days' imprisonment, or both, with each day a separate offense.
Frequently Asked Questions
Are digital billboards legal in O'Fallon?
How bright can a digital billboard be in O'Fallon?
Can an existing billboard along I-64 or I-70 be converted to digital?
Sources & Official References
Other rules in O'Fallon
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