5 Ways You Can Protect the Western Monarch | Cal Parks
Published: November 17, 2022

The monarch butterfly is one of North America's most recognizable and charismatic butterflies, known for its vibrant orange and black wings and unique long-distance, multi-generational migration cycle. Each winter, monarchs make their way to the Pacific coast in California and Baja, Mexico, where thousands of visitors travel to see the stunning monarch clusters. 

Unfortunately, the western monarch population has drastically declined in the last two decades. Many factors include loss of overwintering and breeding habitat, loss of nectar sources, increased pesticide use, natural enemies, and disease. Furthermore, climate change poses an increasing threat that needs immediate attention.

Western monarch at Natural Bridges State Beach.
Western monarch (Danaus plexippus plexippus) at Natural Bridges State Beach.

The western monarch needs your help to protect their migratory path and overwintering sites. Here are five ways you can help protect these critical pollinators while they are overwintering in California:


1. Experience Butterflies at Monarch Groves in California state parks

Experience the wonder and joy of butterflies at a monarch grove in a California state park! With California State Parks as the largest single overwintering site landowner in California, state parks like Natural Bridges State Beach, Pismo State Beach, and Lighthouse Field State Beach are home to key monarch overwintering sites and migration routes. In 2020, Natural Bridges State Beach alone held the largest number of overwintering western monarchs, comprising 28% of the total population.  

Take a trip to these popular overwintering sites and experience the joy of monarchs on your own or with friends and family! Help protect monarchs by visiting, learning, and supporting these critical monarch groves. Remember to respect the wildlife by staying on the path, giving ample space, and packing in all your litter before you leave. 

Check out some of the largest monarch butterfly groves in California state parks at Pismo State Beach and Natural Bridges State Beach


2. Plant Native California Milkweed Away from the Coast 

Milkweed supports a range of pollinators and is the required host plant for monarch caterpillars. However, milkweed loss in monarch breeding areas has contributed to the decline of the population — making the restoration of native milkweed crucial to their protection. 

If you live at least five miles away from the coast, planting native milkweed where it is historically found can help support breeding habitats and future generations of monarchs. Here are three commercially available native milkweeds to help boost monarch habitats:


Narrow-leaved milkweed (Asclepias fascicularis)


Narrow-leaved milkweed (Asclepias fascicularis)
 Most of Northern, Central, and Southern California
Flowering time: May-October

Narrow-leaved milkweed is the most widespread species in California. With huge white and pink flower clusters and big, narrow leaves, this ornamental species is easy to grow and thrives in a wide range of growing conditions.

Showy Milkweed
Showy milkweed (Asclepias speciosa)


Showy milkweed (Asclepias speciosa)
 Mostly in Northern California, forests, mountains, and arid valleys.
Flowering time: May-September

Showy milkweed boasts white to pink to pinkish-purple flowers and offers abundant, high-quality nectar to pollinators.  

California Milkweed
California milkweed (Asclepias californica) | by Joe Decruyenaere, CC BY-SA 2.0 , via Wikimedia Commons


California milkweed (Asclepias californica
 Most widespread in Southern California 
Flowering time: April-July

California milkweed has thick stems and leaves covered with dense hair, contrasted with bright shades of lavender, pink, or white flowers. 

 Do not plant Tropical milkweed 

Do not plant Tropical milkweed (Asclepias curassavica)

Tropical milkweed (Asclepias curassavica
Flowering time: Perennial 

Do not plant tropical milkweed. This is a non-native plant that is highly available in nurseries and can harbor OE (Ophryocystis elektroscirrha), a parasite that disrupts the lifecycle of the western monarchs and increases the mortality rate.  


Check out Xerces Society’s guide to learn more about the various native milkweed species in California, and tips for planting native milkweeds.


3. Plant Native California Flowering Plants 

Support monarch populations by planting native flowering plants. Planting a diverse array of nectar and flowering species provides western monarchs with the nectar resources to make it through the winter and gives them a boost to prepare for migration.


Pacific Aster (Symphyotrichum chilense)
Pacific Aster (Symphyotrichum chilense)


Pacific Aster (Symphyotrichum chilense
Along the California coast and inland Coastal ranges
Flowering time: Summer-Fall

This native perennial is a late-season nectar source for many pollinators. Growing in many habitats, especially along the coast and coastal mountain ranges, they display flower colors from violet to pink to white.

California goldenrod (Solidago velutina ssp. californica)
California goldenrod (Solidago velutina ssp. californica)


California goldenrod (Solidago velutina ssp. californica)
 Northern, Southern, and Central California
Flowering time: Summer-Fall

California goldenrod is a native perennial herb that tends to grow in open grassy places and produces masses of yellow flowers when many other plants are dormant.  

Coyote brush (Baccharis pilularis)
Coyote brush (Baccharis pilularis)


Coyote brush (Baccharis pilularis)
 Along the Central coast and inland to Coastal ranges
Flowering time: Year-round

This common shrub is extremely easy to grow, drought resistant, and potentially fire resistant, producing yellow to white flowers all year-round! 

Read Xerces Society’s Monarch Nectar Plants: California guide to help you choose the best native nectar and flowering plants to include in your pollinator garden! 


4. Protect Monarchs from Harmful Pesticides 

Protect monarchs by avoiding the use of harmful pesticides. Pesticides – such as neonicotinoids – have received attention in recent years for their role in the decline of pollinator populations, including monarchs. Plants absorb the pesticides and can pass the toxic chemicals onto monarch caterpillars that feed on the leaves of treated plants.   

Before purchasing native plants from nurseries and garden centers, be sure to ask whether they have been treated with pesticides such as neonicotinoids. Learn more with the Monarch Joint Venture’s 'Risks of Neonicotinoid Use to Pollinators’ guide

5. Donate to Protect Monarchs  

Donate this Giving Tuesday to help support monarchs and the state parks they rely on! Your gift today will ensure that everyone can enjoy this iconic species and parks for generations to come


Monarch cluster at Pismo State Beach.
Monarch cluster at Pismo State Beach.


Bonus Action!

Raise awareness and encourage your friends and family to help protect the western monarch. Use our social media toolkit to share your love and support for the beloved butterfly.    

We hope you will join us and use #CalparksMonarchs to protect the western monarch this #GivingTuesday for generations to come!