Perimenopause stages: early vs late, and what changes in each

The stages of perimenopause, early vs late, explained simply: how your cycle changes in each stage, what tends to happen, and what comes after your last period.

By The Change Champions team · Updated 2026-10-01

Part of our guide: Perimenopause basics: what it is, stages and how long it lasts

You know perimenopause can last for years, and you're trying to work out where you are in it. Are you right at the start, or closer to the end? Asking about the stages of perimenopause, early vs late, is a sensible way to make sense of a transition that can feel long and unpredictable.

This article explains how researchers divide perimenopause into stages, the cycle changes that mark each one, what tends to happen along the way, and what follows your last period. If you're new to the topic, start with what perimenopause is and come back here.

The short answer: researchers split perimenopause into an early and a late stage, based on your periods. In early perimenopause, the length of your cycle keeps changing by 7 days or more from one cycle to the next. In late perimenopause, you go 60 days or more without a period. Perimenopause ends with your final period, which is confirmed after 12 months with none, and postmenopause follows.

How the stages of perimenopause are defined

The staging most researchers and clinicians use comes from the Stages of Reproductive Aging Workshop, updated at a 2011 meeting and known as STRAW+10. It was published in 2012 in the journal Menopause and is widely used in the US and elsewhere.

STRAW+10 is built mainly on something you can observe yourself: your menstrual cycle. Its authors say cycle patterns remain the most important criteria. Hormone tests and ultrasound measures are only supportive, used as needed, and aren't required. The system is designed to apply to women regardless of age, background, body size or lifestyle.

It describes the years before perimenopause too. In the late reproductive stage, cycles are still regular. Toward the end of it, subtle changes can begin, most often cycles getting a little shorter than they used to be.

One more detail is worth knowing. In STRAW+10, perimenopause starts at the early stage of the transition and ends 12 months after your final period. So the word covers the transition itself plus that first year afterward.

Early perimenopause: cycles become less predictable

The marker for early perimenopause is increased variability in the length of your cycle. STRAW+10 defines it as a persistent difference of 7 days or more in the length of consecutive cycles. A cycle is counted from the first day of one period to the first day of the next.

In practice, that might look like a 25-day cycle followed by a 33-day cycle, with another cycle of a very different length within the next few months. STRAW+10 counts the change as persistent if it happens again within 10 cycles of the first one. A single odd cycle after a stressful month isn't the same thing.

What else tends to change. The Menopause Society says cycles may be shorter than usual at first, the number of bleeding days can change, and flow may be heavier or lighter. In early perimenopause, it may be an occasional skipped period. Our guide to irregular periods in perimenopause covers what's typical and what isn't.

Why hormone tests are unreliable here. In the early stage, FSH, a hormone that rises as the ovaries age, is raised but variable. One test might look normal and the next might not, which is why cycle changes are a better guide.

Symptoms can start before or during this stage. Some women notice sleep changes, mood changes or hot flashes early on, sometimes before their periods have changed at all. The first signs of perimenopause goes through these in detail.

Late perimenopause: longer gaps between periods

Late perimenopause is marked by going 60 days or more without a period. The Menopause Society describes the same shift: what starts as an occasional skipped period becomes longer gaps.

According to STRAW+10, this late stage lasts on average 1 to 3 years. STRAW+10 describes this stage as a time of extreme swings in hormone levels, with more cycles in which no egg is released.

Symptoms often peak. STRAW+10 notes that symptoms, most notably hot flashes and night sweats, are likely to occur in this stage. The Office on Women's Health says hot flashes are most common in the year before and the year after your last period.

You can still get pregnant. Even if you've missed periods for a month or a few months, pregnancy is still possible during perimenopause. If you don't want to become pregnant, keep using contraception until your doctor says you can stop.

A long gap between periods doesn't mean the last one has come. Only 12 months without a period confirms that.

The last period and postmenopause

Your final menstrual period is the end point of the menopausal transition. You can't know it's your last at the time. It's only confirmed after 12 months in a row with no period. That date, looking back, is menopause. The average age of menopause in the US is 52.

STRAW+10 also divides the years after menopause into stages, because hormones don't settle immediately.

Early postmenopause. The first two stages each last about a year, around two years together. During this time, FSH keeps rising and estrogen keeps falling until about two years after your final period, and hot flashes are most likely. After that comes a stabilization stage estimated to last 3 to 6 years. In all, early postmenopause lasts about 5 to 8 years.

Late postmenopause. After that, the reproductive hormone changes level off. STRAW+10 notes that the effects of general aging become the main focus from here.

Symptoms don't necessarily stop at your last period. The Office on Women's Health says recent studies show hot flashes can continue for up to 14 years after menopause. For more on timelines, see how long perimenopause lasts, and for the difference between the terms, perimenopause vs menopause.

When to talk to a doctor

Knowing your stage can help you understand what's happening, but it isn't a reason to wait if something feels wrong. Talk to your doctor if symptoms are affecting your life at any stage.

Some bleeding changes always need checking. The National Institutes of Health advises seeing a provider for heavy bleeding, periods that come very close together, spotting, or periods lasting longer than a week. The Office on Women's Health says bleeding or spotting after a year without a period needs checking too.

If your mood is very low or you feel hopeless, talk to your doctor. If you have thoughts of harming yourself, call or text 988 (the Suicide & Crisis Lifeline). Call 911 in an emergency, such as bleeding so heavy you feel faint.

Frequently asked questions

How do I know if I'm in early or late perimenopause?

Look at your cycle lengths over several months. If they keep varying by 7 days or more from one cycle to the next, that fits the early stage. If you've gone 60 days or more without a period, that fits the late stage. Tracking your periods makes this much easier to see.

How long does late perimenopause last?

On average, 1 to 3 years, according to the STRAW+10 staging system. It ends with your final period, which you'll only know about once 12 months have passed without another one.

Can a hormone test tell me what stage I'm in?

Usually not on its own. FSH levels are raised but variable in early perimenopause, so a single result can be misleading. STRAW+10 treats your menstrual pattern as the most important guide and hormone tests as supportive only.

Are hot flashes worse in late perimenopause?

For many women, yes. STRAW+10 notes hot flashes and night sweats are likely during the late stage, and the Office on Women's Health says they're most common in the year before and the year after the last period. They can start earlier, though, and can continue for years afterward.

Your next step

Start writing down the first day of each period, and count the days between them. After three or four cycles, you'll have a much clearer idea of which stage fits you, and a useful record to share with your doctor. The Menopause Society suggests a calendar or smartphone app for this.

To pull your symptoms and cycle changes together in one place, try our symptom check-in.

This article is general information, not personal medical advice. If you have symptoms that worry you, please speak to your doctor.

Any bleeding after 12 months without a period should be checked by your doctor, even if it's light.

Sources

Written by The Change Champions team, an independent educational site. Not reviewed by a clinician. How we write and fact-check.