Summer Parenting Time in Missouri & Illinois

Every June, the same questions hit our inbox. “School ended Friday — does the regular schedule still apply?” “Can my ex take the kids to Florida for two weeks without telling me?” “We never agreed on summer. What now?”

Summer parenting time is the single most contested period in any parenting plan, and it’s almost always because the plan itself is vague, silent, or contradictory once school is out. This article walks through how summer parenting time schedules generally work in Missouri and Illinois, what your plan should say, and the practical fixes if it doesn’t say enough.

Quick Take: If your parenting plan does not specifically define a summer schedule, your regular school-year schedule controls by default — but that almost always creates problems by July. Read your plan first, then read this article.

Your plan controls — until it doesn’t

The first place to look is always your written parenting plan or court order. If it has a defined summer schedule, that controls. If it doesn’t, the regular school-year schedule generally stays in effect by default, but with predictable problems: weekday transfers built around school pickup don’t make sense in July, “after school” exchanges have no anchor, and extracurricular logic falls apart.

In Missouri, parenting plans are required to address “how the winter, spring, summer and other vacations from school will be spent” under RSMo 452.310. In Illinois, every parenting plan and allocation judgment must include a parenting time schedule and any other provisions addressing the child’s needs under 750 ILCS 5/602.10(f) — which, in practice, is where summer, holiday, and vacation arrangements belong. If yours is silent on summer, that’s a drafting defect — not a license for either parent to do whatever they want.

How summer parenting time schedules typically look

There is no single “right” summer schedule. The most common structures we see:

Continuation of the school-year schedule with each parent getting one or two uninterrupted weeks of vacation time.
Week-on / week-off rotation for the entire summer, often with one extended block carved out for each parent.
Extended blocks — for example, two consecutive weeks with Parent A, then two consecutive weeks with Parent B, alternating across the summer.
Geographic-distance schedules — if parents live far apart, summer typically gives the non-residential parent a larger uninterrupted chunk to make up for less time during the school year.

Drafting Checklist — Three Things Every Summer Schedule Should Define:

When summer starts and ends (last day of school? a specific date?)
How vacation weeks get selected (deadline to pick, who picks first in odd vs. even years)
How weekly or weekend exchanges work during summer if they’re different from the school year

The travel question

This is where most summer parenting time disputes actually start.

In-state travel during your own parenting time generally does not require the other parent’s consent unless the plan specifically says so. Best practice is to share an itinerary as a courtesy.

Out-of-state travel during your own parenting time is also generally permitted unless your plan restricts it. Most plans require notice — usually written, often with a minimum number of days, and including travel dates, destination, and contact information.

International travel is a different category. Most plans require the other parent’s written consent and surrender of the child’s passport between trips. If your plan is silent on international travel, do not assume you can leave the country without consent. Even where it’s technically permitted, traveling internationally without the other parent’s written authorization is a common trigger for emergency motions and, in worst cases, custody interference allegations.

Warning — Passports: If your child does not yet have a passport and one parent objects to issuing one, the U.S. State Department generally requires both parents’ consent for a minor’s passport application. That alone has derailed many summer plans.

What’s different about Missouri and Illinois in practice

The statutory frameworks are similar, but the courts treat summer parenting time disputes differently:

Missouri courts tend to enforce the written plan strictly during summer. If the plan is silent, judges generally default to the regular schedule and expect the parents to work out vacation by agreement.
Illinois courts under the post-2016 allocation framework are somewhat more flexible about modifying summer arrangements where the plan is vague, but expect parents to mediate or use the plan’s dispute resolution mechanism first.
GAL involvement during summer disputes is more common in Illinois than in Missouri, particularly in high-conflict cases where one parent is alleging interference with summer parenting time.

These are general tendencies. The judge, the county, and the case history matter at least as much as the state.

Common summer parenting time mistakes

After years of these disputes, the same gaps keep appearing:

No defined start date. “Summer” without a defined start triggers a fight every June.
Vacation week selection with no deadline. If the plan says each parent gets “two weeks of vacation” but doesn’t say when they need to pick, expect a standoff.
No tiebreaker for overlap. Both parents picking the same week, with no rule for who wins.
Camp and summer activity signups. Who enrolls? Who pays? What happens when a camp falls during the other parent’s time?
Right of first refusal misapplied. Plans drafted around school-year childcare often don’t make sense when summer activities are involved.
Holiday provisions that don’t address the Fourth of July. This is the single most-litigated summer holiday and the one most plans forget to allocate.

What to do if your plan is broken

If you’re already in a dispute over summer parenting time, options in order of cost and escalation:

Re-read the plan together. Half the disputes resolve when both parents actually read the same paragraph.
Use the plan’s dispute resolution clause. Mediation, parent coordination, or whatever was built in.
Stipulate a one-summer agreement in writing. A short written agreement signed by both parents for this summer only — without modifying the underlying plan — often resolves it.
Motion to modify or motion to enforce. If the plan genuinely doesn’t address the issue, or one parent is violating it, court intervention may be necessary. Timing matters; emergency relief for summer schedule issues is hard to get if you wait until July.

Escalation Ladder (Low Cost → High Cost):

Re-read the plan jointly
Use the built-in dispute resolution clause (mediation / PC)
Sign a one-summer stipulation
File a motion to enforce or modify

When to get help with summer parenting time

If you’re heading into summer with a vague plan, a brewing dispute, or a question about travel — sooner is better. Plans can be updated; ad hoc summer arrangements can be memorialized in writing without going to court; passport disputes can sometimes be resolved with a short order.

If you’re in Missouri or Illinois and you need help with a summer parenting time issue, Hunsinger Law Group can help. Reach out to schedule a consultation.

This article is for general educational purposes only and does not constitute legal advice. Reading this article does not create an attorney-client relationship with Hunsinger Law Group, LLC. Consult a licensed attorney about your specific situation.