Department of Transportation

Many state DOTs have ongoing efforts to protect and restore monarch and pollinator habitat on their own lands and adjacent areas. The "Monarch Highway" is one such effort, which is a collaboration of state DOTs across the monarch's central flyway. Other state initiatives are also listed below. Read on to find out more about national and state roadside monarch conservation efforts.

What is the Monarch Highway and how did it come to be?

The “Monarch Highway” is a symbolic migration corridor that follows Interstate-35 (I-35) from Laredo, Texas, to Duluth, Minnesota, aligning with the central flyway of the eastern migratory population of the monarch butterfly. The symbolic highway is a partnership effort bringing people together to catalyze conservation actions throughout the central flyway. However, in order to bring back the monarchs, conservation efforts are needed from everyone throughout the entire monarch range. The map below shows monarch migration routes, the approximate route of I-35, and the "Monarch Highway" states.

Monarch Highway Map, base layer courtesy of the US Fish and Wildlife Service, modifications by the Monarch Joint Venture.

Who is involved with the Monarch Highway?

I-35 was identified the “Monarch Highway” by the State Departments of Transportation in the central flyway, including Minnesota, Iowa, Missouri, Kansas, Oklahoma, and Texas. However, the effort to conserve monarch butterfly habitat in this corridor extends beyond the roadsides managed by these DOTs. The conservation activities of the agencies, companies, non-profits, and individuals who own and manage land within the corridor can contribute to a network of connected habitat across the landscape for monarchs.

What can I do to help?

The most important action you can take to benefit monarchs and other pollinators is to create or improve habitat that contains native milkweed and wildflowers and develop a long-term maintenance plan for those habitats. Contribute to the Monarch Highway by working with partners to create habitat in your backyard, in marginal weedy areas, at community gardens, on public lands, along utility or transportation rights of way, at schools, on corporate campuses, and just about anywhere else you can think of. For more information about creating habitat for monarchs, visit www.plantmilkweed.org

Your feedback to state and local land management agencies, including DOTs, is encouraged to help support their efforts to expand monarch habitat conservation at roadsides, rest areas and other public land. Your vocal support of these efforts is critical to their work to improve and maintain areas for pollinators on public lands.

The handout below is available for download and printing. You are welcome to download it to learn more, or print it to distribute in your monarch conservation outreach efforts. Click here or on the image of the handout to download a PDF.

Monarch Highway Handout

What are the state DOTs doing to contribute to monarch conservation?

Both within and outside of the “Monarch Highway” states, state Departments of Transportation are working on roadsides, rest areas, and in surrounding habitat areas to conserve monarchs. To find out more about the efforts happening in your state or region, see the links below. This may not be a comprehensive list of all work underway. If you are aware of DOT or roadside conservation initiatives not represented here, please contact us!

Monarch Highway States

Iowa

In Iowa, state law prohibits mowing roadside vegetation or in medians on interstates, primary highways, and secondary roads prior to July 15. The Iowa DOT administers the Living Roadway Trust Fund, a grant program for integrated roadside vegetation management activities throughout the state – to create “safe and effective habitat for wildlife which can coexist with highways." Iowa DOT is a committed member of the CCAA for Rights-of-Way (see Other Resources and Information below).

Kansas

For the past 15 years the Kansas DOT has been planting and protecting pollinator habitat by introducing a wide variety of native wildflowers to their standard seed mixes.  KDOT also revised their mowing policy limiting the frequency and timing of mowing to allow native wildflowers and grasses to set seed and spot spraying of herbicides rather than broad application of chemicals.  In 2016 KDOT joined the Monarch Highway to further promote and protect pollinator habitat along the I-35 corridor.  For more information on KDOT’s pollinator efforts visit their website at http://pollinatorpartners.ksdot.org/ or contact Melissa Davidson, KDOT Bureau of Right of Way, Roadside Vegetation Management, 785-296-0853.

Minnesota

The Minnesota Department of Transportation (MnDOT) actively maintains, restores and constructs roadside habitats for pollinators and other wildlife using a variety of techniques – including prescribed fire. MnDOT is working to promote pollinator habitat on roadsides, rest areas and other lands it manages, and is funding and/or participating on several projects focused on furthering our understanding roadside use by pollinators. Find more information about MnDOT's pollinator efforts online or contact Tina Markeson, MnDOT Office of Environmental Stewardship, Roadside Vegetation Management Unit Supervisor, 651-366-3619.

Oklahoma

The Oklahoma Department of Transportation (ODOT) is working to support the native vegetative habitats for the Monarch butterfly and other pollinator species, which grow naturally within our right of ways.  ODOT’s efforts include decreased mowing practices during critical Monarch migration seasons, partnering with other pollinator habitat conservation organizations and planting Monarch specific, pollinator friendly gardens. More information can be found by contacting Amanda Alexander or Kait Taylor in the ODOT Environmental Programs Division, 405-521-3050.

Texas

TxDOT pollinator conservation actions are summarized here. TxDOT is partnering with state DNR to conserve the monarch butterfly, restricts mowing to twice a year (after spring bloom season, and again after fall blooms), uses IVM to protect wildflower lifecycle, does not broadcast herbicide, employs district vegetation managers who promote beneficial habitat that is appropriate to road type, educates adjacent landowners about the economic benefits of vegetation diversity, plants monarch gardens at rest areas. TxDOT’s wildflower program is a tourist attraction. Also notes extensive partnerships (More information here: Texas Monarch and Native Pollinator Conservation Plan – p. 26-30).

Additional State DOT Initiatives

Alabama

The Alabama DOT has create wildflower plots on their lands. Visit the ALDOT website to get in touch.

Arizona

The Arizona DOT avoids grass-only seed mixes and incorporated wildflowers into their native-only seed mixes (FHWA’s BMPs page 53). They are a committed member of the CCAA for Rights-of-Way (see Other Resources and Information below). Visit the ADOT website for more information.

Colorado

Colorado has designated 183 miles of Highway 76 “Colorado Pollinator Highway.” This is part of CDOT’s larger effort to restore pollinator habitat by improving mowing practices, spot spraying noxious weeds, and using bio-controls to control weeds in roadside (article). CDOT is piloting new approaches to funding and operationalizing plantings for pollinators. More information here.

Connecticut

This state law in CT permits the DOT to create pollinator habitat by partnering with other organizations and using state funds. It also restricts the use of neonicotinoids. View the law here.

Delaware

Delaware DOT is a committed member of the CCAA for Rights-of-Way (see Other Resources and Information below). They also reduced mowing outside safety strip on SR 1, pollinator test plots on I-95 and in the medians elsewhere (article), and installed a 43-acre pollinator mitigation site outside Middletown (poster).

Georgia

Georgia DOT s a committed member of the CCAA for Rights-of-Way (see Other Resources and Information below). They have also established wildflower plantings, partnered with Ray to disseminate pollinator seed packets and created a 5,000 sq. ft. pollinator garden at a Visitor Center on I-85 (article).

Illinois

In Illinois, a new mowing policy restricts mowing to a single pass (15’) along all roadsides and limits mowing outside this area to the fall. Additionally, in 2018 medians will only be mowed one pass – and beyond that only outside the restriction dates. Research suggests that there is now 80,000 acres of more habitat and the density of milkweed stems has increased 3000% (Draft Mid-America Monarch Conservation Strategy). The state budget line item for Pollinator Habitat Preservation and Restoration commits $500,000 annually (Draft Mid-America Monarch Conservation Strategy). IDOT is a committed member of the CCAA for Rights-of-Way (see Other Resources and Information below).

Louisiana

LDOT has created native micro-prairies for pollinators at new rest stops. See this article for more information.

Maryland

The MDOT SHA Pollinator Habitat Plan requires SHA to designate certain sites as pollinator habitat that must be managed appropriately (without neonicotinoids or other pesticides that are toxic to bees). State law requires the State Highway Administration, the state DNR and Maryland Environmental Service to each establish a pollinator habitat plan.

Mississippi

Mississippi State University has partnered with the DOT and others to create pollinator habitat in roadsides – e.g., along 22-mile corridor on US 82 between Carrollton and Kilmichael (article, article).

Nebraska

NDOT’s activities include: seed mixes include 10-20% native wildflowers (by weight), funded research project with Univ. of Nebraska to explore the value of wildflower islands and their effect on pollinating species, revised mowing policies to minimize interference with pollinator life cycle, participates in state pollinator efforts, involved with state DNR’s “Nebraska’s Cowboy Trail.” View their website for more information.

North Carolina

NCDOT has partnered with NC Dept of Agriculture to extend NCDOT’s Wildflower Program by planting for pollinators along right-of-way, and together they have received corporate sponsorship to increase the impact of polliantor plantings along roadsides (article).

North Dakota

ND DOT existing pollinator practices include: Highway 1804 and I-94 incorporated pollinator species into seed mix; included pollinator species in seed mix for Crystal Springs Rest Area; added pollinator species to upland seed mixes for future mitigation sites. Future goals include: changes to mowing policy to facilitate pollinator habitat enhancement, pollinator plantings as rest areas, prioritizing roadside vegetation management to expand natural vegetation (Source: North Dakota Monarch Butterfly and Native Pollinator Strategy).

Ohio

ODOT has implemented Monarch Joint Venture’s mowing guidance. All counties are encouraged to stop mowing for maintenance or visibility May1-June 30 and then again July 15-October 15. State will continue to maintain a 30’ safety zone from the pavement’s edge % (Draft Mid-America Monarch Conservation Strategy). The Ohio Statewide Roadside Pollinator Habitat Program Restoration Guidelines and Best Management Practices developed guidance document to help with site selection, plant selection, seed mixes, preparation, planting and management for pollinator habitat along roadside. ODOT is a committed member of the CCAA for Rights-of-Way (see Other Resources and Information below).

Tennessee

TDOT Pollinator Habitat Program includes: (1) Best Management Practices (BMPs) through the use of Integrated Roadside Vegetative Management (IRVM), (2) modifying mowing schedules to be compatible with pollinator life cycles, (3) utilizing swath mowing to reduce costs and increase habitat, (4) pollinator plantings are included in new construction/rehab projects, (5) establishing pollinator meadows at Welcome Centers/Rest Stops, (6) developing pilot projects in each region, (7) creating informational signage.

Virginia

In 2014, VDOT developed and implemented a pollinator habitat program to create areas planted with nectar plants and other pollinator species. Program goals: (1) habitat enhancement, (2) maintenance cost reduction, and (3) use of Integrated Vegetation Management (IVM) to increase E&S control, reduce stormwater runoff, reduce pesticide use and increase habitat/aesthetic values.

Washington

WSDOT’s Pollinator Program: (1) preserving native habitat wherever possible, (2) managing roadsides for natural succession, (3) areas beyond safety zone will only be mowed as part of multiyear strategy, (4) partnering with others to promote pollinator health, (5) incorporating pollinator habitat into mitigation and stream restoration sites, (6) creating pollinator plots at rest areas, (7) implementing selective herbicide use policy, (8) selecting roadside plant species that are long-lived, native and that can outcompete noxious weeds (to facilitate less invasive management regimes), (8) incorporating diversity to the greatest extent feasible into landscape designs, (8) developed maintenance guidance to protect pollinator species and their habitat. Future activities: increasing awareness of pollinator importance, conducting habitat preservation/restoration, updating IVM annually, finding grant opportunities, monitoring the effectiveness of pollinator seed mixes (fact sheet).

Wisconsin

The Wisconsin DOT is a committed member of the CCAA for Rights-of-Way (see Other Resources and Information below). The Wisconsin Pollinator Protection Plan provides BMPs for establishing pollinator habitat and specific guidance for maintaining roadside for pollinators (p. 7) – e.g., salt tolerant planting near road edge, staggered/restricted mowing regimes, fast green up time for erosion control, maintaining safety zones, collaboration/communication to ensure long-term management success. WisDOT began planting native grasses and forbs along roadsides in the 1970s and has increased efforts in recent years.

Other Resources and Information

Candidate Conservation Agreement with Assurances for Rights-of-Way: Transportation agencies, gas and electric utilities and other energy organizations, and the U.S. Fish and Wildlife Service are working together to develop a national Candidate Conservation Agreement with Assurances (CCAA) to help protect and restore monarch and other pollinator habitat in rights-of-way and associated landscapes. Find more information about the Rights-of-Way As Habitat Working Group here.

Roadsides as Habitat for Monarch Butterflies NCHRP Project: Monarch Joint Venture is leading a project with partners at Oklahoma State University, Environmental Incentives, and the Xerces Society, to provide tools for transportation managers to provide monarch habitat in their roadside rights-of-ways. Find more information about this project here.   Get Involved!