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Americans see gardening changes as 'plant hardiness zones' shift across half the U.S.

Here's a quick tool to find out if your zone has changed due to warmer temperatures.

Photo by Jonathan Kemper on Unsplash, Map by USDA-ARS and Oregon State University (Public Domain)

The USDA has issued a new Plant Hardiness Zone Map

Millions of American households have a garden of some sort, whether they grow vegetables, fruits flowers or other plants. Gardening has always been a popular hobby, but more Americans turned to tending plants during the height of the COVID-19 pandemic for both stress relief and to grow their own food so they could make less trips to the store. For many people, it's a seasonal ritual that's therapeutic and rewarding.

But a shift is occurring in the gardening world. Now, due to rising temperature data, half the country find themselves in a different "plant hardiness zone"—the zones that indicate what plants work well in an area and when to plant them. Gardeners rely on knowing their hardiness zone to determine what to plant and when, but they haven't been updated since 2012.

The U.S. Department of Agriculture updated its Plant Hardiness Zone Map in late 2023, months before people in most of the country start planning their planting. We saw the 10 hottest summers ever recorded in 174 years of climate data between 2014 and 2023, but hardiness zones are actually determined by the coldest winter temperatures each year. Winters are warming at an even faster pace than summers, according to nonpartisan research and communications group Climate Central, but that may or may not be the entire reason behind the zone changes.

The USDA acknowledges that some of the zone shifts could be due to climate change but cautions against using them as hard evidence for it since factors such as improved data collection also contribute to changes in the map.

people planting flowers

Gardening can be a solo or community endeavor.

Photo by Kenny Eliason on Unsplash

"Temperature updates to plant hardiness zones are not necessarily reflective of global climate change because of the highly variable nature of the extreme minimum temperature of the year, as well as the use of increasingly sophisticated mapping methods and the inclusion of data from more weather stations," the USDA wrote in November 2023. "Consequently, map developers involved in the project cautioned against attributing temperature updates made to some zones as reliable and accurate indicators of global climate change (which is usually based on trends in overall average temperatures recorded over long time periods)."

At the same time, Chris Daly, director of the PRISM Climate Group at Oregon State University that developed the map with the USDA, told NPR, "Over the long run, we will expect to see a slow shifting northward of zones as climate change takes hold."

As an example of zone shifting, Dallas, Texas, was classified as Zone 8a in 2012, when data showed the coldest winter temperature in the city was between 10 and 15 degrees Fahrenheit on average. In 2023, with data showing the coldest winter temps falling between 15 and 20 degrees Fahrenheit, it's been shifted to Zone 8b.

Some zone shifts resulted in moving to an entirely new zone number, such as Seattle shifting from Zone 8b to Zone 9a. The overall trend was for zones to be pushed northward, but not all areas saw a shift. NPR has a helpful tool here in which you can enter your zip code, see what zone your city was previously in, what zone it's in now, and the temperature changes that caused the shift.

The bottom line is if you have a gardening book with a hardiness zones map printed before 2024, it's time for an updated map. Or check online to see what zone you fall in now to give your garden the best chance of thriving this year.


This article originally appeared on 5.19.24

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A dad helped his son make protest signs for his toy dinosaurs and they went viral.

When 4-year-old Jackson started a "dinosaur garden" in his front yard, he never intended to make a political statement.

Jackson's dad, Bill Rebeck, says Jackson was helping a neighbor with his own garden one day outside their Capitol Hill home when the neighbor gave him a handful of plastic dinosaur toys. Overjoyed, Jackson ran home and grabbed a few of his own, then posed them all outside.

The dinosaurs stayed there for months, eventually becoming a staple of the neighborhood.

"People move them around all the time," Bill Rebeck says. "They say they go out of their way to walk by the dinosaurs."

When Bill met someone one day who didn't live anywhere near them, and even she knew about the dinosaurs, he knew the family had reached a tipping point.

"After the election, we were trying to do something with our frustration with our country," Bill says. "My wife said, 'We should have our dinosaurs protesting.'"

After all, people knew them! Despite being inanimate pieces of plastic, Jackson's dinosaurs had a platform.

So whether his wife, Andria, was joking or not, Bill says almost immediately he had four or five great ideas for dinosaur protest signs.

The family quickly got to work.

Photo by Bill Rebeck, used with permission.

The dinosaur protest quickly caught the attention of people in the neighborhood. And then, the world.

A neighbor tweeted some photos of the display, and they went viral in a heartbeat.

Signs like, "Climate change = Extinction" and "Dinosaurs for science!" were a massive hit.

Bill didn't realize what was happening until a neighbor he barely knew knocked on his door and said a reporter was looking for him.

"I think people would laugh at my lack of sophistication on social media," he says.

He also wants to clarify he and his wife aren't forcing Jackson into any political stances. But, as parents, they're very worried about the state of the world.

"I'm torn between this feeling of being horrified about our country and finding it so ridiculous that it's hard to take seriously," he says, adding that he sees Trump's climate change denial as a terrifying red flag.

"For me, the only thing I can do is make plastic dinosaurs talk."

But judging by the reaction on social media, it sure looks like people are listening.

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A South L.A. school is paving the way for more green spaces in underserved communities.

This L.A. school garden isn't just growing fresh fruits and veggies — they're also growing the leaders of tomorrow.

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Dignity Health 2017

In South Los Angeles, there is a 1.5-acre lot filled with bountiful garden beds growing everything from collard greens to kumquats.

On a crisp day in sunny L.A., students from all walks of life are tending to the fresh fruits and colorful veggies. Some are watering newly planted seedlings, while others are gathering jalapeños and kale for the freshest taco ever.

All images via GAP, used with permission.

This lot, called the Fremont Wellness Center and Community Garden, is located at the John C. Fremont High School campus, and it also has a small park, a community health clinic, and a soon-to-be-finished 1,500-square-foot greenhouse.

"It’s a big thriving community" says Megan Laird, the garden and youth program manager. And with so many opportunities all in one space, it's easy to see why.

One reason this green space is flourishing is because of the Gardening Apprenticeship Program, or GAP for short.

"It’s a program where high school youth from the John C. Fremont High School campus can come and participate in a course that trains [them] to become leaders in health, urban agriculture, and civic engagement," says Laird.

Through a 10-week program in the spring and the fall, the students learn about local and industrial food systems, how food justice affects communities, and how they can turn this knowledge into action within the larger community. And, of course, they learn basic gardening skills and environmental science.

"By the end of the 10 weeks, we feel confident that the youth are familiar with not just how the fruits and vegetables are grown on the site, but what they can do with them moving forward," adds Laird.

The project was started by the Los Angeles Neighborhood Land Trust (LANLT), a nonprofit with a mission to promote safer and stronger communities by creating more urban parks and community gardens — something severely lacking in L.A.'s underserved neighborhoods.

The best part? The students are applying the lessons in their own lives.

"The biggest lesson that I have learned during my time in this program has been becoming a leader," writes Elizabeth Castro, a GAP student staff leader, in an email. "I am not as shy as I was before and it has helped me prioritize my education and future."

Other students say that being in the garden has helped them get through tough times in their lives, allowing them to open up about their battles with stress and depression. Some have also spearheaded efforts to partner with the environmental club on campus to collect food scraps for composting and waste reduction. No matter the hurdle, they overcome it as a unit.

"What I love most about working in the garden is that I can work with friends and know that the work we do can be shared with the community," writes Kevin Nagrete, a GAP apprentice leader, in an email.

More than just having loads of fun, the students are also helping expand the program.

GAP regularly invites professional chefs to demo how to use the produce in the garden to make healthy delicious dishes at home. In fact, GAP has seen so much success with their nutrition programs that they're now also partnering with the UC Cooperative Extension to create a new culinary after-school course.

These developments are particularly important given that it can be difficult to access fresh foods in certain areas of L.A. In South L.A., 72% of the restaurants are fast-food establishments. Plus, 90% of the food retailers are small stores that often don't provide healthy alternatives. And if they do, they usually lack the quality and freshness that you'd find in more affluent neighborhoods.

Thankfully, GAP's seed of change is well on its way to growing more green spaces (and even more leaders).

A 2006 UCLA study found that Los Angeles was well behind other major west coast cities in terms of park space. Even worse, a 2016 report done by the LANLT found that less than 30% of the total L.A. population — the majority of which are from low-income communities — have access to parks in their area.

That's why a group of GAP leaders are branching out and becoming involved in a separate program by the LANLT — the Park Equity Leadership Academy. Through this program, the students join other L.A. communities in advocating for more green spaces all around the city.

It's the next big step in their growth as leaders and one that'll pave the way for a brighter and greener future.

If you want to help out their cause, you can do so right here and follow all their progress on Instagram.

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