How Long After Ovulation Does BBT Rise (And Why)?

How Long After Ovulation Does BBT Rise (And Why)?

Exact Answer: 24 hours

Basal body temperature (BBT) is a person’s temperature when a woman is at rest. Women need to track their BBT so they know when they are ovulating, with this a woman can determine when she is most and least likely to become pregnant.

The eggs are normally fertile within about 12-24 hours after ovulation. If you avoid sex for a few days after ovulation it can help prevent pregnancy. One should be aware that the cycle may change making it difficult to determine ovulation.

How Long After Ovulation Does BBT Rise

How Long After Ovulation Does BBT Rise?

The basal body temperature (BBT) will drop slightly before ovulation begins, that is 24 hours after the release of the egg, its temperature rises and is maintained for several days. Before ovulation, women’s average body temperature is 97 ° F and 97.5 ° F. After ovulation, it rises to 97.6 ° F at 98.6° F.

You can track your cycle by taking BBT every morning using a body temperature calculator or thermometer. Check your temperature at the same time every day before getting out of bed. Then, take notes of the results. If you have a somewhat regular cycle, the chart can help you predict when you will ovulate next.

Tracking the BBT more can make your predictions more accurate. Often taking BBT helps to measure and keep a track of ovulation; however, BBT alone cannot predict future ovulation.

BBT is slightly lower during the follicular phase which is also known as the first half of the menstrual cycle, increases after ovulation, and remains elevated during the luteal phase that is the second half of the menstrual cycle.

The change in temperature after ovulation is negligible in which the BBT only increases 0.5 ° F / 0.3 ° C to 1.0 ° F / 0.6 ° C and can easily be affected by factors such as illness, alcohol, and changes in sleep, this change occurs in response to the amount of progesterone released after ovulation.

Basal body temperature


Body TemperatureTime (in days)
97.9 F2

Why Does It Take So Long For BBT To Rise After Ovulation?

The change in Basal body temperature (BBT) depends on a number of factors, including hormone levels. During ovulation, the hormone progesterone causes a rise in temperature. It rises higher within two weeks of waiting. Then, just before your period begins, your progesterone hormone levels drop.

This means that your basal body temperature will also drop if you are not pregnant, in which case your temperature will continue to rise due to high progesterone levels.

When you observe the Basal body temperature charts, you are basically looking for the big picture, not the temperature rise in one place or another. Your temperature may rise and fall as your cycle continues, but you should notice a biphasic pattern after ovulation which means that the average temperature is lower before ovulation than after ovulation.

By observing at least three consecutive increases in average temperature, you will most likely know that ovulation occurred the day before the first comes out to be maximum.


A basal body temperature chart is a great way to keep track of your cycles and ovulation patterns, and can also help your doctor determine if ovulatory infertility is possible. If you are concerned that you are not ovulating, bring your BBT card to your gynecologist that is because when pregnancy is detected, the BBT chart can give only small clues.


In cases related to BBT and Ovulation, it may take some time to get used to monitoring and recording temperature and learning about changes in your body as well as the other signs that you are in a cycle include breast tenderness, pain around the ovaries, and a condition of the cervical lining.

So, many women keep track of this when they start and when they end. However, you can always consult a doctor for further queries. No matter how tempting it can be to look for early signs of pregnancy and although can be stressful to wait for a pregnancy test at the same time.


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22 thoughts on “How Long After Ovulation Does BBT Rise (And Why)?”

  1. The article offers a valuable resource for women seeking to gain knowledge about BBT and its implications for fertility tracking and family planning. It’s highly beneficial for understanding the reproductive physiology.

    1. Absolutely, it’s an excellent guide for women to comprehend BBT and its significance in the context of reproductive health. The practical advice and scientific information make it an indispensable source of knowledge for women.

  2. Avatar of Jonathan Powell
    Jonathan Powell

    The article is quite comprehensive in explaining the intricate relationship between BBT and ovulation. However, it could include more details about the hormonal mechanisms underlying the changes in BBT throughout the menstrual cycle.

    1. I concur. A deeper insight into the hormonal regulation of BBT would enhance the overall quality of the article by providing a more in-depth understanding of the physiological processes involved in ovulation.

  3. Avatar of Palmer Charles
    Palmer Charles

    I found the article very engaging and informative, but the limitations of BBT should have been more emphasized.

    1. I completely agree. It’s important for readers to understand the limitations and potential inaccuracies of relying solely on BBT for fertility awareness. A more balanced approach would enhance the quality of the article.

    2. True, while the article provides insightful information, it could benefit from a more detailed discussion about the drawbacks of using BBT as a standalone fertility tracking method.

  4. This article is very helpful in understanding the correlation between BBT and ovulation and how women can utilize this knowledge to make informed decisions about pregnancy planning.

    1. Indeed, it provides invaluable information about BBT tracking and its significance for fertility awareness. The thorough breakdown of the key concepts helps to shed light on this complex topic.

  5. This article provides useful insights into how women can monitor their reproductive health and fertility through BBT tracking. The detailed explanations are enlightening and enriching.

    1. Avatar of Patrick Walker
      Patrick Walker

      I agree. The article is an informative resource for women to understand the physiological changes during the menstrual cycle and how BBT can serve as a valuable tool in fertility awareness.

  6. The article is clear and factual about the different phases of a woman’s menstrual cycle and how BBT can be helpful in tracking them.

  7. The comprehensive coverage of BBT and ovulation in this article is commendable, offering a wealth of information for women interested in tracking their fertility patterns and understanding the physiological basis of BBT changes.

    1. Avatar of Chelsea Stevens
      Chelsea Stevens

      Absolutely. It’s a well-researched and insightful article that provides a nuanced understanding of BBT and ovulation, empowering women with knowledge to make informed decisions about their reproductive health.

    1. I couldn’t agree more. The article is very informative and descriptive in recommendations to prevent pregnancy.

  8. The article provides a comprehensive overview of BBT tracking and ovulation, shedding light on the intricate relationship between hormonal changes and body temperature. However, the explanation of BBT’s limitations could be more extensive.

    1. I agree. While it offers valuable information, a more detailed discussion of the potential drawbacks and limitations of BBT tracking would enhance the article’s comprehensiveness and provide a more balanced perspective.

    2. Furthermore, a more in-depth exploration of potential confounding factors affecting BBT, such as lifestyle and health conditions, would further enrich the article’s content and provide a more holistic view of fertility tracking using BBT.

  9. This piece of writing is really educative, and it tells you what exactly happens to your body during the different stages of your cycle.

    1. Agreed, it breaks down the information really well, making it easily understandable for readers to know how to use BBT as a fertility awareness method.

    2. It’s so enlightening. It provides a great understanding of how BBT is relevant in a woman’s reproductive cycle.

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