How long does the allergy season last and what are the key dates?

Pollen allergy

When the topic of spring comes up, we often associate it with pleasant weather, rain, festive gatherings, blooming flowers, and the unfortunate onset of allergies. This particular season is famous for the abundant flowering of various plants, which subsequently release pollen that has adverse effects on people with allergies. In response to an allergen, the immune system initiates a cascade of symptoms, which can be quite pronounced, including watery eyes, frequent sneezing, itchy throat and nose, incessant runny nose, and, in some cases, the appearance of hives.

In this article we are going to tell you How long does the allergy season last and what are the key dates?.

Increase in allergy cases

spring allergies

The increase in allergy cases usually occurs during the months of April to June, coinciding with the beginning of spring. The timing of these allergies can vary, with some years experiencing an early onset and others persisting into July. The length of the allergy season depends on the rainfall and temperatures observed in the previous months. It is important to note that not all allergies are exclusive to spring, as certain trees such as alders and cypresses can trigger allergic reactions as early as January.

From a technical point of view, allergies in Spain manifest themselves differently depending on whether you are in the northern or southern areas of the peninsula. When talking about pollen seasons, There are different variations in four areas: the north, the center, the Mediterranean area and the Canary Islands.. For example, allergies to alder are non-existent in the Canary Islands, while allergies to apiaceae are common, unlike the rest of Spain, where they are not a cause for concern.

Allergy calendar


During the spring season it can be observed that in the month of March the presence of pollen from palm trees, pines, plane trees, poplars, oaks, elms and urticaceae reaches medium levels. Once April begins, people with allergies will need to closely monitor levels of the following allergens:

  • Banana (ends at the end of April)
  • Olive trees (until June)
  • Grasses (until July in the center and October in the Mediterranean area)
  • Cupressaceae (cypress, until May)
  • Birches (until May)
  • Pine (until mid-July)
  • Oak (until September in some areas)

During most of the year, various allergens, such as mugwort, chenopodiaceae, grasses, palms, plantago, and mercurials, are constantly present in the Mediterranean region. These allergens maintain a moderate to low concentration year-round, but experience significant increases in pollen levels during the spring or fall seasons.

To accurately assess the impact, it is essential to diligently monitor pollen levels. The duration of allergies varies by location, so It is important to consult various resources to stay informed about current pollen levels and better manage allergy symptoms.. The University of Córdoba offers a complete website with weekly updated pollen incidence maps categorized by allergen and region.

If you suspect you have allergies or experience symptoms during the spring season, it is recommended to seek the expertise of a specialist who can perform tests to identify specific allergies and prescribe appropriate treatments for a more bearable spring.

seasonal allergies

allergy date

spring allergies

As the winter weather fades, the arrival of spring brings with it a notable outdoor allergen: tree pollen. This well-known allergen is the first to make its presence known in the air. However, it's important to note that there are other possible triggers for spring allergies, including various types of grass and weed pollen. Examples of these They include orchard fruit, saltgrass, and fescue, which are becoming more common. So while warmer weather may be a welcome change, it's crucial to be prepared for the allergens that come with it.

During days with strong gusts of wind, spring allergies can be aggravated as pollen is carried effortlessly through the air. It is essential to stay informed about daily pollen levels to identify specific trees, such as cedar, maple or oak, which can cause sneezing and a runny nose during the spring season.

summer allergy season

During the summer months, the focus is on outdoor activities and having a good time. However, it is essential to ensure that allergies do not impede your enjoyment. Nature undergoes pollination during this season, with grass pollen being the main culprit of summer allergies. To avoid any discomfort, It is advisable to plan ahead and refrain from mowing the grass on days when you have outdoor plans., such as entertaining guests, hosting a barbecue, or simply relaxing outdoors. This precautionary measure will help minimize the spread of grass and pollen, ensuring a pleasant experience for everyone.

The presence of a warm, humid climate provides ideal conditions for the proliferation of mold, which can act as a catalyst for allergies. During the period from July to early autumn, allergic reactions caused by fungal spores are more common. These spores have a propensity to grow on various surfaces, such as grass, grains, logs, and compost piles.

autumn allergies

Although the freshness of the air can be quite pleasant, it is important to keep in mind that fall allergies are usually the result of weed pollen. Ragweed, a common allergen, has the ability to flourish in various locations. Even if you don't live near a ragweed plant, Its pollen has the ability to travel great distances through the wind, causing symptoms in unsuspecting individuals.

Another concern to consider is the presence of mold, which has the ability to thrive in moist soil and decaying foliage. As the temperature decreases, we tend to spend more time indoors and use heating systems, which causes the circulation of dust mites in the air. These microscopic creatures are known to cause allergies all year round.

winter allergies

In the winter season, outdoor pollen levels tend to decrease compared to other times of the year. However, some people may still experience allergies indoors, which can be caused by various factors such as mold, dust mites, pets and even Christmas trees. These allergies, known as "perennial" allergies, persist year-round, but may be more common during the winter due to increased indoor activity caused by cold weather.

I hope that with this information you can learn more about when the allergy season extends and what the key dates are.

Leave a Comment

Your email address will not be published. Required fields are marked with *



  1. Responsible for the data: Miguel Ángel Gatón
  2. Purpose of the data: Control SPAM, comment management.
  3. Legitimation: Your consent
  4. Communication of the data: The data will not be communicated to third parties except by legal obligation.
  5. Data storage: Database hosted by Occentus Networks (EU)
  6. Rights: At any time you can limit, recover and delete your information.