The Monarch Monitoring Project is a long-term study on monarch migration through Cape May, NJ. It is a part of the New Jersey Audubon Research Department, and closely affiliated with the Cape May Bird Observatory.

Monday, October 25, 2021

Big flight on October 22

Our blog has moved to a new location: For those of you who still connect to this page however, here is a blog post for October 24, 2021: A Second Influx by Kyra Madunich
Cape May Point turned into a swirling snow globe of monarchs on October 22nd. For nearly three hours, a steady stream of thousands of monarch butterflies headed west along the dunes on Cape May Point. Monarch numbers had built up over the course of a few days prior to the big flight, congregating at various roost sites on the point.
When monarchs arrive to the tip of the Cape May Peninsula and realize they must cross water to continue their journey south, they often opt to stay put, bask in some sunlight, and fuel up on nectar from flowers until a day with the right weather conditions makes the journey a bit easier. Thanks to the protected native habitat along Cape May Point’s dunes and the wonderful residents who keep butterfly gardens with fall flowering plants, these monarchs have a good supply of nectar during their stay. However, we did not expect the massive influx of new monarchs that came in from the north and which swept through on the 22nd, joining those already on Cape May Point to form one of the largest flights of recent years. It was a spectacular sight to behold.
We look forward to seeing what monarch numbers will be like in the coming weeks, though we’ve seen much lower numbers these past few days and it is likely that most have already passed through. Though we are sad to see them go, we know that the monarchs still have over 2,000 miles left on their journey to their overwintering sites in Mexico. We wish them luck, and we are excited at the prospect of our friends to the south reporting monarchs tagged on our project! If you see a monarch, remember to check their hind wings for a small, circular adhesive sticker. Each tag has a unique 4-letter, 3-number code. If you happen to see a monarch with a tag, the easiest way to read the code on the tag is to try to snap a photo and zoom in on the butterfly’s wing. Then report the code online at Our fastest monarch ever recorded flew 558 miles from Cape May Point to Georgia in just 3 days, and we are proud to say that we’ve now also had nearly 100 tagged recoveries in Mexico.
If you don’t already, follow us on Facebook and Instagram @capemaymonarchs, and we will keep you posted on all things monarch as much as we can.

Wednesday, September 22, 2021

A Cold Front is Coming!

Our blog has moved to a new location: For those of you who still connect to this page however, here is a blog post for Sept. 23, 2021: A vital element to the Cape May Monarch Monitoring Project is our road census, which gives us a method to compare the numbers of monarchs around the Cape from week to week and from year to year. A member of our team drives a designated 5 mile route 3 times daily at a slow speed, counting every monarch seen along the way. Our first three weeks of census are complete, and the numbers verify our hunch that the monarch numbers have been a bit below average up to this point of the season. This isn’t really a surprise, since we’ve had a lot of warm weather and winds from the south or from the east. Monarchs usually migrate when the winds are blowing from the north, and a westerly component to the wind often brings more monarchs toward the coast, and then down into Cape May Point. In recent years we’ve had a lot of unfavorable winds during the first half of September, and it’s been a while since we have seen many monarchs on those days. This might be about to change. A big cold front is predicted to arrive on Thursday, bringing a lot of rain, but clearly out on Friday, the first of four consecutive days when northwest winds are predicted. These are the conditions that frequently bring big numbers of monarchs into Cape May. Can we guarantee lots of monarchs during the next few days? Of course not, nature isn’t ever fully predictable, but we’re hopeful, and I can guarantee that our team will be out in the field, ready to count, study, tag, and teach about monarchs, however many there may be.

Monday, September 20, 2021

  Our blog has moved to a new location:

For those of you who still connect to this page however, here is a blog post for Sept. 20, 2021:  

We are nearly three weeks into the field season for the Monarch Monitoring Project, and on Sunday (Sept. 19) we started to see the season’s first major influx of monarchs into Cape May Point.  We also conducted our first three tagging demos on Friday through Sunday, with good attendance each day.


Seasonal Field Naturalist Kyra Madunich at a tagging demo

Tagging demos will continue each Friday, Saturday, and Sunday through October 10, each held at 2:00 pm under the east picnic shelter at Cape May Point State Park.  No reservations are required, and no fee is charged, though contributions to support our program are accepted.  During the following weekend, Oct. 15 – 17, we will have demos at noon at the Cape May Convention Hall as part of the New Jersey Audubon Cape May Fall Festival, details on our website: We’ll then have one more weekend with tagging demos, Oct. 22 – 24, when due to the shortening day length our demos switch to 1:00 pm.


Field Naturalist Madison Null teaches at the demo

You can meet one of our researchers on Mondays through Thursdays as well, from now until October 21, by meeting at Cape May Point’s Triangle Park at 11:00 am.  These are not formal projects, just opportunities to meet a member of our team and learn a bit about our work.  Our researcher may be working on garden maintenance, perhaps tagging monarchs, or otherwise working on one of the many tasks involved with our project.  One thing for sure – they’ll be happy to answer your questions about monarch biology and about the work we conduct.


Field Coordinator Louise Zemaitis shows visitors how to tag a monarch

Will Sunday’s influx of monarchs into Cape May Point continue through the week?  We wish we knew, but unfortunately there’s no way to predict.  One thing for sure: there will be at least a few monarchs here every day until late October, and maybe even early November.  On some days there will be lots and lots, we just don’t know which days that will happen.  So come often, enjoy everything that Cape May has to offer, and keep your fingers crossed, hoping to catch a day when monarchs seem to be absolutely everywhere.

A young visitor delights in a tagged and released monarch

Sunday, December 6, 2020

Silent Auction for Handmade Monarch Quilt

UPDATE: Current high bid is $450.

SILENT AUCTION! This handmade quilt with a monarch butterfly motif has been donated to the Monarch Monitoring Project to help raise funds for our project.  The artist is Dale Watson, an accomplished quilt maker and volunteer with our Project.  The quilt, which measures 64 x 76 inches, will go to the highest bidder on Tuesday, December 15, as of 2:00 pm, Eastern Standard Time.  We will promptly ship the quilt as soon as the donation is received (or we can deliver personally if the high bidder is in Cape May County).  Opening bid is $100.  Place your bid via a private message on our Facebook page,, (preferred), or via e-mail to  Send us the amount of your bid, along with your name, e-mail address and phone number.  We will post updates on the bidding here on our blog and on the Facebook page. 

Here's the quilt, measuring 64x76 inches

Detail view

Like many others, our project has fallen short of our fundraising goals this year, primarily because we were unable to offer our usual public programs.  Our primary expenses are the salaries of the two young naturalists we hire for our fall field season each year, along with tags and field equipment.  If you don't win the auction but still wish to contribute, send a check payable to NJ Audubon with "Monarch Project 024" on the memo line, to CMBO-CRE, 600 N Delsea Drive, Cape May Court House, NJ  08210.  Thanks to all who support our work!

Quilt artist Dale Watson visiting the
Cerro Pelon Sanctuary in Mexico, 2018.

Please share with other monarch enthusiasts!

Sunday, November 8, 2020

November Monarchs

    Our field season runs from September 1 to October 31, and in some years we see very few monarchs after about October 20.  Big numbers of migrating monarchs arrive to the winter colony sites right around the beginning of November.  Since those colonies are 2000 miles away from Cape May, it makes sense that most monarchs should have passed through this area weeks earlier.  Early last week we saw a few days with cold, windy, and rainy weather, with reports of freezing temperatures and snow from northern New Jersey right up through all of New England.  Monarchs don't survive prolonged freezes, so we figured the migration was over.  For the last several years we have continued to conduct our census into November as a test.  We decided to do that again this year, but when there were no monarchs to be seen during the cold weather -- for a couple of days the census counts were all zero -- we figured our season was truly finished.

Monarch on lantana in Cape May Point, 11/6/20

    Then the weather changed, and suddenly we came into a spell of warm, sunny days.  And monarchs were back!  At first it was just a few, but numbers quickly grew.  It's nothing like the big numbers of early October, but it's still a surprise.  Our seasonal naturalists finished their work at the end of October, but we still have volunteers in town, and collectively we have tagged more than 200 monarchs over the last three days.

Monarch tagged at Cape May Point 11/8/20

    Unfortunately there's not a lot of nectar available for these late monarchs.  We're seeing virtually all of them in the few gardens that still have flowers in bloom -- Mexican sunflower, zinnia, lantata, and Vitex are still blooming in several gardens.  There's also a bit of the seaside goldenrod in bloom out on the upper beach.  But most places have no flowers left.  Many of the monarchs being tagged have little or no fat reserves, and fat provides the fuel for migration.  Will they find enough food to tank up for the next part of their journeys?  Will they find enough nectar as they go south from here to sustain them on their long travels?  Can they avoid freezing temperatures and make it all the way to Mexico?  We really don't know, and we assume that the odds are against the November monarchs, but we continue to actively tag, in hopes that some will be found further south and will provide hints, at least, to the answers to these questions.  We will be astounded (and delighted) if one of these November monarchs makes it to Mexico and the tag is seen by one of the observers there.

    We're also curious about where these November monarchs have come from.  Some that we are seeing are worn or even tattered, suggesting they've been around since before the early November storms, and they might not be fit enough to even try to migrate away from Cape May.  We are also seeing some that are pristine, looking very fresh.  We know that there are late caterpillars each year, and we suspect that as long as the weather permits, there will be newly emerged monarchs entering the population.  We know that they can't have come from terribly far north of here, for the freezes of early November in much of the northeast would have been fatal to any remaining monarchs, whether they were still caterpillars or if they had metamorphosed into the chrysalis or adult stages.  So it's our guess that our November monarchs began their lives in southern New Jersey or southeastern Pennsylvania.

    As long as the monarchs are still here, we will continue to conduct our censuses and we will keep tagging some of the monarchs that are in Cape May Point.  When we are tagging, we often attract curious onlookers, which gives us the chance for an impromptu lesson into monarch biology and conservation.  If you're in Cape May Point while our warm November weather continues, and if you see one of us out there with a butterfly net, don't hesitate to ask about our work, we're always eager to talk about monarchs.

Project Director Mark Garland gives an impromptu lesson about monarchs, 11/8/20

    A reminder: if you see a tagged monarch, make an effort to read the 4-letter, 3-number code on the tag -- the easiest way to do this is often to take a digital photo and then enlarge it on a computer until you can read the code.  Then go online to the website printed on the tag,, and add the requested data.  Watch the website in the coming months, for once all the data is assembled they'll report on all tagged monarchs that are subsequently found and reported.

Releasing a newly tagged monarch, 11/8/20

    We have started to compile the season's tagging data, but our annual summary will have to wait until we are truly finished with tagging for the year.  Rain is expected to come later this week, but it's predicted to stay relatively warm, so perhaps we'll keep seeing (and tagging) monarchs for another week or more. When we finally finish, we'll report back on the total number tagged by our team in 2020.

Thursday, November 5, 2020

Results of 2020 Census

Monarch nectaring on seaside goldenrod, Cape May Point

    Perhaps the most important parts of the Cape May Monarch Monitoring Project is the census that we conduct.  Our census is modification of a technique known as a "Pollard Transect," whereby a specified route is traveled on a regular basis and butterflies counted by the observer while traveling.  Our census is conducted daily from September 1 to October 31, and consists of a slow drive along a 5-mile route that leads from the west end of New England Road to Alexander Avenue in Cape May Point.  One observer drives at roughly 20 miles per hour and counts all of the monarchs observed along the route.  The census is conduct three times a day from September 1 to October 15, and then twice a day from October 16 to 31.  The number of monarchs seen along the route and the time of travel are recorded and then calculated to monarchs observed per hour.  These data are used to compare one year to another.  This census has been faithfully conducted every year since 1992, giving us 29 years of data.  Our data are summarized on a weekly and annual basis in this chart: 

    So how did 2020 compare to other years?  It was a good year of migration, with the 13th highest yearly average of monarchs observed per hour, 62.4, slightly above the median.  Putting it another way, 12 years have had a higher average but 16 have had lower.  There are many variables that affect the census numbers from year to year, but two seem to be most significant.  One is rather obvious: when the monarch population is high, we can expect to see more monarchs in Cape May.  The other significant variable is weather, with wind direction being the most significant.  A westerly component to the winds is likely to cause many monarchs to drift eastward, and if they end up on the east side of Delaware Bay, their preference to stay over land as long as possible will funnel them into Cape May.  Conversely, when the wind is blowing from the east, many monarchs coming from the north are likely to end up on the west side of Delaware Bay, bypassing Cape May altogether.  The same situation has been observed and is well documented with migratory birds, which are seen in the greatest numbers during the southbound migration when winds are from the west or northwest.  We saw favorable winds more frequently this fall than in many recent years.

Small roost of monarchs at Cape May Pt. State Park, Oct. 5, 2020

    Large average monarchs/hour totals for weeks 6 and 7 correspond to a 2-week period during the first half of October when monarchs were plentiful around Cape May.  It's quite unusual for Cape May to have consistently high numbers for two solid weeks, usually our peak numbers occur for just a few days at a time, though often we will see several peaks during the two-month migratory period.  Even though travel is severely limited this year due to the COVID-19 pandemic, and our education program was severely curtailed as we insisted on compliance with all pandemic precautions, we were able to help many local residents see and appreciate monarch migration during this period, and many more enjoyed the abundance vicariously through our social media posts.

Monarchs roosting in ivy at Cape May Point, October 11, 2020

    When you look at our 29 years of census data, it's noteworthy that while the numbers have some dramatic fluctuations (our highest yearly total is more than 40 times higher than our lowest year), the overall trend seems generally stable.  Some biologists have looked at our data and argued that it indicates that monarch populations are in good shape.  We are very reluctant to jump to that conclusion. Monarchs funneled through Cape May are a very small percentage of the numbers found all across the continent.  Censuses at the wintering areas in Mexico show dramatic declines in monarch numbers.  If monarchs in Cape May are doing okay for some reason, it certainly doesn't imply that monarchs everywhere are equally well.