Hay fever season in the UK usually runs from spring to early autumn. Tree pollen tends to affect people first, grass pollen often peaks in late spring and summer, and weed pollen can remain a problem into early autumn.

Key Takeways

Hay fever season in the UK usually runs from spring into early autumn, with tree, grass, and weed pollen peaking at different points in the year.
Grass pollen is a major trigger for many people and often causes the worst symptoms in late spring and early summer, but some people are affected earlier or later depending on what they react to.
If symptoms are severe, keep returning despite treatment, or do not fully fit the usual hay fever pattern, it is worth speaking to a clinician to review your symptoms and explore appropriate treatment options.

What hay fever actually is

Hay fever, also called seasonal allergic rhinitis, is an allergic reaction to pollen. When someone with hay fever breathes in pollen, their immune system treats it as a threat and releases chemicals that trigger symptoms.

Typical symptoms include:

sneezing
an itchy or blocked nose
a runny nose with clear mucus
itchy, red, or watery eyes
an itchy throat or mouth
worsening symptoms outdoors, especially on dry or windy days

Hay fever can be mild, but it can also interfere with sleep, concentration, work, travel, and time outdoors. Some people also find it aggravates asthma or makes breathing symptoms harder to manage.

Hay fever or something else?

This is an important distinction. Not every runny nose in spring or summer is hay fever.

Hay fever is more likely if:

symptoms come back around the same time each year
itching is a major feature, especially in the eyes or nose
symptoms are worse outdoors
sneezing comes in repeated bursts
nasal discharge is clear rather than thick or discoloured

A cold or another upper respiratory problem may be more likely if:

you feel generally unwell
you have a fever
you have aches or marked fatigue at the start
the problem lasts only a short time and does not follow a seasonal pattern
mucus becomes thick, yellow, or green

Symptoms such as one-sided facial pain, significant wheezing, shortness of breath, or symptoms that are continuing outside the usual pattern should not simply be assumed to be hay fever.

When is hay fever season in the UK?

Hay fever season in the UK usually begins in spring and can continue into early autumn. The main reason it feels so long is that different pollens dominate at different times.

Broadly speaking:

tree pollen tends to affect people in spring
grass pollen tends to peak in late spring and summer
weed pollen tends to become more relevant in late summer and early autumn

The exact timing can shift slightly depending on the weather, temperature, rainfall, and where you live, but the overall pattern is usually quite consistent year to year.

UK pollen calendar by month

January to February

For most people, these are low-pollen months. Hay fever is less likely to be the cause of nasal and eye symptoms in mid-winter, so if symptoms are present at this time of year, it is worth considering other explanations such as infection, indoor allergy, or non-allergic rhinitis.

March to April

This is when tree pollen becomes more relevant. If you tend to start sneezing, rubbing your eyes, or feeling congested early in the year, tree pollen may be the trigger.

People often notice:

itchy or watery eyes
sneezing on dry days
nasal irritation that seems to worsen outdoors
symptoms that improve indoors or after rain

This stage is often underestimated because many people still think of hay fever as a summer problem.

May

May is often a transition month. Tree pollen may still be an issue, but grass pollen begins to play a larger role. For people who react to grass pollen, symptoms may start to become more persistent at this point.

This is also the month when timing starts to matter. If you only begin treatment once symptoms are already severe, you may feel as though nothing is working well enough.

June to July

For many people in the UK, this is peak hay fever season. Grass pollen is often at its highest, and symptoms can become much more disruptive.

Common problems during this period include:

constant sneezing
streaming or irritated eyes
a blocked nose that affects sleep
poor concentration during the day
feeling exhausted because symptoms are worse at night

If symptoms are getting in the way of work, driving, exercise, or normal daily life, it is usually a sign that self-management is no longer enough.

August to September

Grass pollen often starts to ease, but weed pollen can continue to cause problems into late summer and early autumn. Some people are caught out by this because they assume hay fever should have finished by then.

If your symptoms regularly continue into August or September, it may be because your trigger is not mainly grass pollen.

October to December

Outdoor pollen levels are usually much lower by this stage. If hay fever-like symptoms are continuing well into autumn or winter, it is sensible to step back and ask whether the diagnosis is definitely straightforward.

Persistent congestion, recurrent sinus-type symptoms, ongoing throat irritation, or regular eye symptoms outside the expected season deserve a closer look.

When is hay fever usually worst in the UK?

For many people, the worst period is late spring into mid-summer, particularly June and July. That lines up with peak grass pollen season, which is a major trigger for a large proportion of UK hay fever sufferers.

That said, there is no single worst month for everyone. Someone who reacts mainly to tree pollen may struggle earlier in the year, while someone affected by weed pollen may remain symptomatic later into the season.

This is why month-by-month tracking can be useful. If you know when symptoms usually start, when they peak, and when they fade, it becomes easier to decide whether the pattern fits hay fever or whether something else may also be going on.

Why hay fever can feel worse some years

Hay fever severity is not fixed. Symptoms can feel much worse in one season than the next, even in the same person.

That can happen because:

pollen counts are higher
warm, dry, breezy weather spreads pollen more easily
you are spending more time outdoors
your asthma or other allergy symptoms are less well controlled
your usual treatment is no longer enough for the severity of symptoms
you have started treatment later than usual

It is also worth remembering that repeated irritation from pollen can leave the nose and eyes feeling more reactive, which may make the whole season feel harder to manage.

What can help during hay fever season

Most people start with practical measures and pharmacy treatment. Common steps include:

checking the pollen forecast
keeping windows closed when counts are high
washing hair and changing clothes after being outdoors
wearing sunglasses to reduce pollen contact with the eyes
using antihistamines, eye drops, or nasal sprays where appropriate
trying to start treatment before symptoms become severe, if your pattern is predictable

These measures can be very effective for mild to moderate hay fever. The problem is usually not that treatment never works. It is that symptoms are sometimes more severe than expected, or the diagnosis is being oversimplified.

When hay fever may need more than self-care

It is worth speaking to a clinician if:

symptoms are severe enough to affect sleep, concentration, work, or daily activities
over the counter treatment is not controlling symptoms well
you are not sure whether the problem is definitely hay fever
symptoms keep returning but the pattern is unclear
your asthma is worse during hay fever season
you are relying heavily on short-term relief but still struggling

This is where a proper review can be useful. In some cases, the issue is poorly controlled hay fever. In others, there may be another contributing problem that needs to be considered rather than simply increasing treatment.

When to seek urgent advice

Urgent review is sensible if symptoms are accompanied by:

wheezing or shortness of breath
significant worsening of asthma
facial swelling
marked eye pain or changes in vision
symptoms that suggest infection rather than allergy

Hay fever is common, but it should not be used as a catch-all explanation for every spring or summer symptom.

How Ready Health can help

Ready Health offers prescription-only hay fever treatments designed for people with severe seasonal symptoms that have not responded well to standard options such as antihistamines and sprays. These treatments use a corticosteroid therapy that can reduce inflammation from allergic reactions and provide longer-lasting relief throughout the pollen season.

This treatment is only suitable after a clinical assessment with a trained clinician, who will consider your symptom pattern, medical history, and overall health before deciding whether it is appropriate. It should not be used as a first-line option for mild hay fever.

Ready Health’s clinicians provide consultations in person or online, allowing time to review your symptoms, explain your options, and discuss whether prescription treatments are likely to help. If the corticosteroid treatment is suitable, it can reduce sneezing, itchy eyes, congestion, and other hay fever symptoms for several weeks or months.

Because this is a prescription-only treatment administered under medical supervision, the consultation is an essential part of the process. This approach ensures safety and appropriateness for your situation.

FAQs

What month does hay fever usually start in the UK?

It often starts in spring, particularly March or April, but this depends on the type of pollen you react to. Some people do not develop their main symptoms until late spring or early summer.

When is hay fever worst in the UK?

For many people, June and July are the worst months because grass pollen is often highest then. However, people who react mainly to tree or weed pollen may find their worst period comes earlier or later.

How long does hay fever season last in the UK?

It can last from spring into early autumn. The season feels long because different pollens peak at different times.

Can hay fever last all summer?

Yes. This is especially common if you react to more than one type of pollen or if your symptoms continue from grass pollen season into late summer weed pollen season.

How can I tell if it is hay fever or a cold?

Hay fever is more likely if symptoms are seasonal, worse outdoors, and include itching and repeated sneezing. A cold is more likely if you feel generally unwell, develop fever, or the problem does not follow a recurring seasonal pattern.

When should I see a doctor about hay fever?

You should consider getting checked if symptoms are severe, persistent, poorly controlled with standard treatment, affecting sleep or daily life, or not fully fitting the usual hay fever pattern.

Are stronger hay fever treatments suitable for everyone?

No. Stronger treatment is not the right option for everyone and should only be considered after a clinical assessment, especially if symptoms are severe or not responding to standard treatment.

Hay fever calendar UK: when pollen levels peak month by month