How long does perimenopause last?
Perimenopause lasts between two and eight years before your periods stop for good; for most women it is about four. [1] It ends at menopause, which you can only confirm in hindsight, twelve months after your last period, including spotting. [1]
When does the clock start?
Usually in the mid-to-late 40s, according to the Office on Women's Health; the National Institute on Aging says most women begin the transition between 45 and 55. [1][3] ACOG notes that estrogen output starts to fluctuate in the 30s and 40s, and that a change in your menstrual cycle is the common first sign. [4] There is no test that marks day one: hormone levels go up and down unpredictably during the transition, so providers don't usually test unless there is a medical reason such as periods stopping before 40. [1] Our article on the signs of perimenopause covers what the start looks like in practice.
What the early and late stages look like
The Menopause Society describes a progression. In the beginning the changes are often subtle: cycles commonly get a little shorter, the number of bleeding days can be fewer or greater, and flow can be heavier or lighter. [2] As perimenopause progresses, cycle length may vary by seven days or more. [2] Early on there may be an occasional skipped period; in the late transition, women may skip 60 days or more. [2] The changes are driven by the ovaries' erratic hormone production and less frequent ovulation. [2] If you are skipping two or three months at a time, you are probably in the late stage, but "probably" is as precise as it gets until the twelve months are up.
When does it end?
At menopause: a full year since your last period with no bleeding, including spotting. [1] The average age of menopause in the United States is 52 according to the Office on Women's Health and the National Institute on Aging, and 51 according to ACOG; the usual range is 45 to 58. [1][3][4] Two things can shift the end date: smoking is associated with reaching menopause up to two years earlier, and the age your mother went through it is one clue to your own. [1] If you have not had children, pregnancy, especially more than one, may delay it. [1]
Do the symptoms end when perimenopause ends?
Not necessarily, and this is where the four-year figure misleads people. Periods stop; hot flashes may not. In the US Study of Women's Health Across the Nation, frequent hot flashes lasted a median of 7.4 years in total and persisted a median of 4.5 years after the final period. [5] Women whose hot flashes started while still premenopausal or in early perimenopause had the longest course, a median of more than 11.8 years; women whose hot flashes began after menopause had the shortest, a median of 3.4 years. [5] So if your night sweats arrived at 44 alongside the first irregular cycles, plan for a longer road than the headline number suggests. Our article on how long menopause lasts goes through the symptom data in full.
What to track
The first day of every period, on a calendar or an app; the Menopause Society suggests it so the pattern can be reviewed with a clinician, and it is the only way to count the twelve months later. [2] The month hot flashes first appeared, because early onset predicts a longer course. [5]
Can you get pregnant during perimenopause?
Yes. You may still ovulate in some months and it is impossible to know which, so if you do not want to get pregnant the Office on Women's Health says to keep using birth control until one full year after your last period. [1] The Menopause Society gives the same advice. [2]
When to talk to your clinician
Changes in your periods are expected, but ACOG says it is not normal to have bleeding or spotting between periods, bleeding or spotting after sex, bleeding heavier or lasting more days than usual, or any bleeding after menopause, and those belong in an appointment. [6] If your periods stopped before 40, the Office on Women's Health says that is when a hormone test is appropriate, so ask. [1] And if the symptoms, however long they last, are getting in the way of your life, that alone is a reason to go. [1]
Sources
- Office on Women's Health, Menopause basics. Page last updated April 2, 2026. Retrieved 2026-10-17.
- The Menopause Society, Perimenopause (patient education). Retrieved 2026-10-17.
- National Institute on Aging, What Is Menopause? Content reviewed October 16, 2024. Retrieved 2026-10-17.
- American College of Obstetricians and Gynecologists, The Menopause Years. Last reviewed December 2025. Retrieved 2026-10-17.
- Avis NE et al. Duration of menopausal vasomotor symptoms over the menopause transition. JAMA Internal Medicine, 2015;175(4):531-539 (SWAN). Abstract retrieved 2026-10-18.
- American College of Obstetricians and Gynecologists, Perimenopausal Bleeding and Bleeding After Menopause. Last reviewed February 2024. Retrieved 2026-10-17.
Every statement above was checked against the linked source on the date shown. This article is education, not individual medical advice. Related: Signs of perimenopause · When does perimenopause start?