Updated April 2026 | Rank #25 of 51
Car Insurance Cost Per Month in Montana 2026
Full coverage avg
$189/mo
Minimum coverage avg
$57/mo
State minimum reqs
25/50/20
Low density but long driving distances and higher per-mile accident exposure lift rates slightly above states like Idaho. Adjust age and vehicle below to see your estimated monthly cost.
Montana
in Montana with a Sedan
$189/month
Full coverage estimate (100/300/100 + collision + comp). -$19 below national avg
State Min$108/mo25/50/20
Standard$140/mo50/100/50
Full Coverage$189/mo100/300/100
Source: NerdWallet 2026, ValuePenguin 2026, Bankrate 2026
How we calculate thisAverage Monthly Cost by Age in Montana 2026
| Age | Min Coverage | Full Coverage (Sedan) | Details |
|---|---|---|---|
| 16 | $367 | $643 | Age 16page → |
| 17 | $335 | $586 | Age 17page → |
| 18 | $292 | $510 | Age 18page → |
| 19 | $248 | $435 | Age 19page → |
| 25 | $108 | $189 | Age 25page → |
| 35 | $92 | $161 | Age 35page → |
| 45 | $94 | $164 | Age 45page → |
| 65 | $103 | $180 | Age 65page → |
Average Monthly Cost by Vehicle Type in Montana
Top 3 Carriers in Montana by Market Share (NAIC Q1 2026)
1
State Farm
By direct written premium
2
GEICO
By direct written premium
3
Progressive
By direct written premium
Market share data is from NAIC Q1 2026 public filings. Market share does not equal cheapest rate for your profile.
Nearby States by Cost Rank
Montana Car Insurance FAQs
What is the average car insurance cost per month in Montana?⌄
The average car insurance cost in Montana is $189 per month for full coverage (100/300/100 plus collision and comprehensive) as of 2026, per cross-referenced data from NerdWallet, Bankrate, and ValuePenguin. Minimum-coverage-only policies average $57 per month. Montana ranks #25 of 51 jurisdictions by cost (1 = cheapest, 51 = most expensive).
What is the minimum car insurance required in Montana?⌄
Montana requires minimum liability coverage of 25/50/20.
Who has the cheapest car insurance in Montana?⌄
The top three carriers by market share in Montana are State Farm, GEICO, Progressive, per NAIC Q1 2026 market filings. Market share does not equal cheapest price -- the best rate for your specific profile (age, vehicle, driving record, credit score in states where legal) requires comparing quotes. We recommend comparing at least 3 carriers. carinsurancecomparisontool.com offers a side-by-side carrier comparison.
Does Montana have no-fault insurance?⌄
No. Montana is an at-fault state. When an accident occurs, the at-fault driver's liability coverage pays for the other driver's injuries and property damage. This means your state-minimum liability coverage must be high enough to cover a potential claim against you.
Why is car insurance so cheap in Montana?⌄
Low density but long driving distances and higher per-mile accident exposure lift rates slightly above states like Idaho.
Is my credit score used for car insurance in Montana?⌄
Yes, in most cases. Montana allows insurers to use a credit-based insurance score (distinct from your FICO) to predict claim likelihood. A poor credit-based score can add 20-100% to your premium. Improving your credit over 12-24 months can generate meaningful savings at renewal.