When is allergy season in Los Angeles? Seasonal pollen can be present throughout much of the year, with tree pollen typically becoming prominent first, grass pollen picking up through the warmer months and weed pollen becoming more noticeable in late summer and fall. LA’s mild climate means there isn’t always a clear beginning or end to allergy season.
Los Angeles may skip the freezing winters, but your nose still gets a seasonal calendar.
Thanks to LA’s mild climate, different plants can release pollen at different points throughout the year. Add changing weather, overlapping pollen seasons and the occasional Santa Ana wind and allergy season in Los Angeles starts to look less like a single season and more like a rotating cast.
Here’s what may be in the air throughout the year, why the LA allergy calendar is a little different and how to build a simple post-outdoors reset for your nose.
Why doesn’t Los Angeles have a typical allergy season?
Los Angeles has a longer, less defined allergy season because its mild climate allows different trees, grasses and weeds to grow and produce pollen across much of the year.
In colder parts of the country, freezing winter temperatures can create a more distinct pause between pollen seasons. Southern California doesn't always get the same extended break.
Temperature and rainfall can also influence when plants grow and release pollen. Wetter periods can encourage plant growth while warm, dry weather can help pollen become airborne.
That means allergies in Los Angeles can shift from year to year and even week to week.
New to LA? The allergy calendar you knew somewhere colder may not apply here. New city, new neighborhood, new pollen lineup.
For more on how your nose interacts with the environment around you, explore our guide to the nasal microbiome.
What’s in the LA air throughout the year?
While pollen timing isn't exact, understanding the general pattern can help you make more sense of the allergy season Los Angeles residents experience.
Winter and spring: Trees can get an early start
Trees are generally among Southern California's first major seasonal pollen producers, with some beginning during winter and continuing through spring.
Common pollen-producing trees in the region include oak, olive, ash, sycamore, eucalyptus, mulberry and walnut. Exact timing depends on the species and weather conditions.
So yes, that perfectly sunny February afternoon can still come with a pollen count.
Want to go deeper on what's floating around? Read our guide to pollen season.
Spring and summer: Grass sticks around
As temperatures rise, grass pollen can become more prominent. Bermuda and rye are among the grasses that may contribute pollen in Southern California.
And because LA stays relatively warm, grass pollen doesn't necessarily stick to a tidy summer schedule. Tree and grass seasons can overlap, creating a gradual handoff rather than a clear seasonal switch.
Late summer and fall: Weeds take over
By late summer and fall, weed pollen becomes another part of the picture.
California sagebrush, pigweed and Russian thistle are among the regional plants that can release pollen. Outdoor mold spores may also be present during warmer parts of the year.
LA's summer plans may be winding down. The airborne guest list isn't necessarily following.
Year-round: Indoor allergens don’t check the calendar
Not everything bothering your nose has to come from outside.
Dust mites, pet dander and mold can be present indoors throughout the year. Outdoor particles can also make their way inside on clothing, hair, shoes and pets.
If your nose seems more bothered by your bedroom than your morning walk, our guide to indoor allergies can help you understand what may be hanging around at home.
What do Santa Ana winds have to do with LA allergies?
Santa Ana winds can stir up and transport pollen, dust and other airborne particles, potentially increasing exposure for people who are sensitive to them.
These strong, dry winds are one reason the answer to when is allergy season in Los Angeles isn't as simple as checking the month.
Even when a particular pollen season is starting to wind down, windy conditions can move particles through the air or stir up material that has settled on plants and surfaces.
Turns out "windows down" weather sometimes comes with fine print.
How can you tell what’s triggering you today?
If you're asking “is it allergy season in Los Angeles?”, a calendar is a useful starting point, but current conditions can tell you more.
Consider checking a local pollen forecast alongside your weather and air quality before heading out. Pay attention to which pollen types are elevated and whether you notice patterns at particular times of year.
As a quick mental map, think trees in winter and spring, grasses in spring and summer and weeds in late summer and fall. Indoor allergens can potentially be present all year.
Seasonal pollen allergies can include sneezing, a runny or stuffy nose, itchy or watery eyes, an itchy nose or throat and postnasal drip. These symptoms can overlap with other conditions, so if they're severe, persistent, unusual or you're unsure what's causing them, talk with a healthcare professional.
What’s a simple post-outdoors reset for LA allergy season?
Beach afternoon. Outdoor workout. Canyon hike. Three hours on a patio because nobody realized it had been three hours.
Whatever your LA day looks like, a few simple habits can help reduce the amount of pollen and other outdoor particles you bring home.
Check what’s outside before you go outside
Consider checking pollen levels before extended outdoor plans. If levels associated with your triggers are particularly high, you may choose to adjust when you head outside or keep windows closed.
Wash off the day when you get home
Changing clothes, showering or washing your hair after significant outdoor exposure can help keep outdoor particles from settling into your space.
Regularly washing bedding, damp-dusting surfaces and using appropriate air filtration can also help limit buildup indoors.
Don’t forget your nose
Your nose is busy interacting with the air around you all day. Nasal cleansing gives it a reset when you get home.
Saline nasal rinsing can physically wash pollen, dust and other particles from the nasal passages. Sinus Rinse Free + Clear can become a simple cleansing step after outdoor time, while Advanced Sinus Rinse Free + Clear offers another option for your nasal care routine.
Consider it the rinse-off step after whatever LA threw into the air today.
How can Wizard fit into your daily nasal wellness ritual?
At Wizard Wellness, we think your nose deserves the same everyday attention as the rest of your wellness routine.
Start with a nasal rinse to cleanse away pollen, dust and other particles you've encountered throughout the day. Then add Daily Nasal Spray as a refreshing step in your routine.
Behind it all is Wizard's proprietary Nasalbiome™ Technology, designed to support a balanced nasal microbiome.
So, when does Los Angeles allergy season actually end?
When is allergy season in Los Angeles officially over? There isn't one universal end date. Outdoor pollen may become less prominent during parts of late fall and winter, but LA's mild climate, changing weather and year-round indoor allergens mean your personal allergy calendar can look different.
Instead of waiting for one magical pollen-free date, get to know your triggers, check what's in the air and make nasal cleansing part of washing off the day.
LA weather may be unpredictable. Your nasal wellness ritual doesn't have to be.
Frequently asked questions
Is allergy season year-round in Los Angeles?
Pollen can be present during much of the year because of LA's mild climate. Indoor allergens such as dust mites, mold and pet dander may also be present year-round.
What months are allergies the worst in Los Angeles?
There isn't one worst month for everyone. Trees generally become more prominent in winter and spring, grasses in spring and summer and weeds in late summer and fall. Your experience depends on your individual triggers and current conditions.
Does rain make Los Angeles allergies better or worse?
Rain can temporarily remove some pollen from the air, but rainfall can also encourage plant growth that may influence pollen levels later. The overall effect depends on timing, weather conditions and the allergen.
Do Santa Ana winds affect allergies?
Santa Ana winds can move and stir up pollen, dust and other airborne particles, potentially increasing exposure for people who are sensitive to them.
Why are my allergies so bad right now in LA?
Changing pollen levels, overlapping pollen seasons and dry or windy weather may all play a role. Trees, grasses and weeds release pollen at different times throughout the year, while Santa Ana winds can stir up pollen, dust and other airborne particles. Check current local pollen and air quality levels for a better idea of what may be in the air today.