A first DWI in Missouri is generally classified as a Class B misdemeanor.
Jail: none – 6 months; mandatory min none (courts commonly impose 2–5 days or community service)
Fine: $0–$1,000 (up to $1,000 plus costs)
License suspension: 90-day suspension (30-day hard + 60-day restricted) administratively – 1 year; hardship: restricted driving privilege; IID may be required
Ignition interlock: Not required at this level — IID required to reinstate after any alcohol-related suspension where a restricted privilege is used; mandatory on 2nd+.
Alternative disposition: SIS (suspended imposition of sentence) commonly keeps a first DWI off the public record if probation completed; SATOP mandatory.
Administrative (DOR) suspension runs parallel to the criminal case.
Lookback period: lifetime. Lifetime lookback — priors never expire for enhancement. Categories: first offense (no priors); PRIOR offender (1 prior); PERSISTENT offender (2 priors); AGGRAVATED (3 priors); CHRONIC (4 priors); HABITUAL (5+).
Some links on this site are paid advertising and we may be compensated when you use them. Advertising never affects which statutes or penalties we report — how this site makes money.