Last Frost Date: When Is It Time To Plant A Garden In Oswego?

OSWEGO, IL — Inflation, the rising cost of food and the nutritional benefits of homegrown produce have cultivated a new crop of home gardeners in Oswego.

Whether you’re a first-time or experienced gardener, there are important dates you need to know as you think about your garden this spring.

When does the danger of frost pass in Oswego? It’s April 25, according to The Old Farmer’s Almanac, which offers a ZIP code tool to help gardeners figure out when to plant what.

The growing season is 170 days long in Oswego. Looking ahead to fall, the first frost usually occurs around Oct. 13.

According to the publication, there’s a 30 percent probability of a frost occurring after April 25, as the date is determined using National Oceanic and Atmospheric historical data from 1981-2010, and is not “set in stone,” The Old Farmer’s Almanac said.

April 25 represents the average date of the final “light freeze,” which occurs when the temperature dips between 29 and 32 degrees Fahrenheit. At that temperature, tender plants can be killed.

A “moderate freeze,” between 25 and 28 degrees, is destructive to most plants; and a “severe freeze,” at anything under 24 degrees, can do heavy damage to most garden plants, according to the almanac.

As the pandemic’s third gardening season gets underway in Oswego, The Old Farmer's Almanac has another tool to help gardeners decide when to plant which crops.

In Oswego, it’s usually best to start planting corn between April 25 and May 9, potatoes between April 18 and May 9, and spinach between March 14 and April 4.

Here’s a look at other crops, and when the Old Farmer’s Almanac says to begin planting them in Oswego.

• Basil: Between April 25 and May 16
• Bell peppers: Between May 2 and May 16
• Carrots: Between March 21 and April 4
• Lettuce: Between April 11 and May 9
• Tomatoes: Between May 2 and May 23

Even before the pandemic, mental health experts pointed to gardening as a way to deal with stress.

Gardening provides physical exercise and promotes healthier eating, but it can also reduce worry among people who consider themselves perfectionists, psychologist Seth Gillihan said.

“Given the lack of control we have, gardening can be a good antidote for perfectionism,” Gillihan wrote in a 2019 Psychology Today blog. “No matter how carefully you plan and execute your garden, there are countless factors you can't predict — invasions by bugs, inclement weather, hungry rodents.”

With so many things out of their control, perfectionism is a waste of time, he said, so gardeners may ask themselves “why bother” trying to be perfect.