Home Insurance Non-Renewal in Montana: 45 Days’ Notice, the Reason Rule and What a Defective Notice Gets You

Updated September 4, 2026. Quick answer: In Montana your insurer must give you at least 45 days’ written notice before it declines to renew your homeowners policy, and the reason has to be given only if you ask for it. If that notice is late or defective, the non-renewal is not effective. Ending the policy mid-term is a separate event on a separate clock: 10 days. Every answer below is quoted from Montana’s own code and the section is named and linked, because this is the kind of question where the section number is the answer.

What Montana law settles, in four lines

Which policies this covers. Montana’s cancellation and nonrenewal rules are not written specifically for homeowners; they apply broadly to property and casualty insurance generally, except to the extent they conflict with chapter 23 of this title, which covers certain specialty lines such as motor vehicle and professional liability insurance. Mont. Code Ann. § 33-15-1101

Two different letters are in play and the codes handle them separately. A non-renewal declines to write the next term: the policy runs to its expiration date and stops. A cancellation ends the policy mid-term, before the date you have paid through, and is usually limited to grounds the statute lists. The first thing to establish about the letter in front of you is which one it is: in Montana the two carry different notice periods, and the rest of the answer follows from that word rather than from the state.

How much warning Montana requires

45 days. The number on its own is not the rule, though: a day count means nothing without the two things the statute states and the comparison tables drop: what it counts back from, and when the clock starts. Both are on the face of the section quoted here.

An insured has a right to reasonable notice of nonrenewal. Unless otherwise provided by statute or unless a longer term is provided in the policy, at least 45 days prior to the expiration date provided in the policy, an insurer who does not intend to renew a policy beyond the agreed expiration date shall mail or deliver to the insured a notice of the intention not to renew. The insurer shall also mail or deliver a copy to the insured’s insurance producer.

Source: Mont. Code Ann. § 33-15-1105(1)

Whether they have to tell you why

In Montana, the reason has to be given only if you ask for it. That matters more than it looks: the reason is the thing you would have to dispute, and a notice that gives none is a notice that does not comply.

If the insurer or insurance producer receives a written request from an insured within 60 business days from the date on which the insurer mailed a notice of cancellation or nonrenewal to the insured, the insurer or insurance producer shall, within 21 days of receiving the insured’s written request, furnish the insured the information that the insurer or insurance producer used to make its decision. A notice is not effective unless it contains adequate information about the insured’s right to make the request.

Source: Mont. Code Ann. § 33-15-1107(1)-

What a late or defective notice actually gets you

This is the part of the law worth knowing and the part that almost never appears in a comparison table. In Montana, the non-renewal is not effective.

A notice is not effective unless it contains adequate information about the insured’s right to make the request.

Source: Mont. Code Ann. § 33-15-1107

The other letter: mid-term cancellation

10 days, and this is the clock that applies when the insurer ends the policy before its expiration date rather than declining the next term.

An insurer may not cancel an insurance policy before either the expiration of the agreed term or 1 year from the effective date of the policy or renewal date, whichever is less, except: (a) for reasons specifically allowed by statute; (b) for failure to pay a premium when due; or (c) on grounds stated in the policy which pertain to the following: (i) material misrepresentation; (ii) substantial change in the risk assumed, except to the extent that the insurer should reasonably have foreseen the change or contemplated the risk when the contract was written; (iii) substantial breaches of contractual duties, conditions, or warranties; (iv) determination by the commissioner that continuation of the policy would place the insurer in violation of this code; (v) financial impairment of the insurer; or (vi) any other reason approved by the commissioner. (2) Except as provided in 33-23-401, cancellation under subsection (1) is not effective until 10 days after a notice of cancellation is either delivered or mailed to the insured. (3) Subsections (1) and (2) do not apply to a newly issued insurance policy if the policy has been in effect less than 60 days at the time the notice of cancellation is mailed or delivered. A cancellation under this subsection is not effective until 10 days after the notice is delivered or mailed to the insured.

Source: Mont. Code Ann. § 33-15-1103(1)-

What is specific to Montana

• One Montana carve-out stands out from the general property-and-casualty scope: a separate statute specifically bars insurers from cancelling or refusing to renew “home owner insurance” because the insured operates a qualifying day-care facility in the home. Mont. Code Ann. § 33-15-1101
• Montana’s insurer only has to disclose its reason if the insured asks in writing within 60 business days of the notice, with 21 days to answer, except that this section does not apply if the ground for cancellation or nonrenewal is nonpayment of the premium and the reason is stated in the notice, in which case the disclosure has already happened up front. Mont. Code Ann. § 33-15-1107(1)-
• Unlike most states, Montana does not shorten the notice period further for nonpayment of premium: the same 10-day cancellation notice applies whether the ground is nonpayment, a newly issued policy still in its first 60 days, or any other permitted reason once that window closes. Mont. Code Ann. § 33-15-1103(1)-
• Montana’s “not effective” rule is narrower than it sounds: it ties specifically to the notice omitting the insured’s right to request the reason for the decision, not to missing the day count itself, and the statute never says what coverage status follows once a notice is ruled ineffective. Mont. Code Ann. § 33-15-1107

What this page does not tell you

• “Not effective” is where the statute stops. It does not go on to say what coverage you then have, and this page does not supply an answer the code does not contain.
• This is what the code requires, not what a court has done with it. No case law was read. A state whose courts supply a remedy the code omits will read as silent here, and that is the honest limit of a statutory page.
• Your policy can be more generous than the statute and never less. These are floors. Your own contract may promise more notice; it cannot promise less.
• Catastrophe moratoria are a separate rule. Several states suspend non-renewals in a declared-disaster area on their own timetable, with their own trigger. Folding that into a notice period would misstate both.
• No federal answer exists to check this against. Congress left the business of insurance to the states, so the answer is genuinely different in every jurisdiction and a national number is not a thing that exists.

Two neighbouring questions are answered elsewhere: the claims file your insurer read before deciding and what your lender buys if you end up uninsured.

Sources

Every figure on this page was read from the section linked beside it and the quotations were machine-checked against the bytes of the page each was retrieved from. 0 of the 195 cells in this wave rest on a secondary source.

All 51 jurisdictions, including Montana, are compared on the by-state non-renewal table.

General consumer information, not financial, tax or legal advice. State insurance codes are as published by the cited source on 2026-09-04 and change without notice; your own policy and your state’s insurance department govern.