“Tomorrow’s” or “Tomorrows”? When the Apostrophe Actually Belongs

In almost every sentence you’ll write, the correct form is “tomorrow’s” — with the apostrophe. That’s because you’re usually describing something that belongs to tomorrow: tomorrow’s meeting, tomorrow’s weather, tomorrow’s deadline. As Grammar Monster explains, time words take a possessive apostrophe exactly like people do — a day’s pay, a week’s notice, tomorrow’s schedule. A real-time checker like TypoGuard catches the moment you leave that apostrophe out.

The Rule: Time Can “Own” Things Too

We’re used to apostrophes showing that a person owns something — Sarah’s laptop. What trips people up is that units of time work the same way. When you say “tomorrow’s plans,” you’re really saying “the plans of tomorrow.” That “of” relationship is exactly what the apostrophe signals.

A quick test: if you can reword the phrase with “of,” it needs an apostrophe.

tomorrow’s forecast → the forecast of tomorrow (apostrophe)
a day’s work → the work of a day (apostrophe)

When “Tomorrows” (No Apostrophe) Is Correct

There’s one case where “tomorrows” with no apostrophe is right: when you mean more than one tomorrow — the plural. This is rare and mostly shows up in poetic or reflective writing:

• ✅ “We can’t keep chasing better tomorrows.”
• ✅ “She thought about all her tomorrows.”

If you’re not deliberately talking about multiple future days, you almost certainly want the apostrophe version.

The Three Forms at a Glance

• tomorrow’s = belonging to tomorrow (the common one) → Tomorrow’s game is sold out.
• tomorrows = plural, many future days (rare, literary) → endless tomorrows
• tomorrows’ = belonging to multiple tomorrows (extremely rare, almost never needed)

Why This Slip Is Easy to Make

Leaving out the apostrophe in “tomorrow’s” doesn’t create a misspelled word — “tomorrows” is a real word — so a basic spellchecker stays silent. The mistake is grammatical, not spelling, which is exactly the kind of error that slips through. A grammar checker Chrome extension like TypoGuard reads the sentence and flags a missing possessive apostrophe before you send “tomorrows meeting” to your whole team.

Want to stop worrying about where the apostrophe goes? Install TypoGuard for free and let it handle possessives automatically.

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