Pull beets 60 to 80 days after seeding, and get them out before summer heat reaches the roots. After that, the storage rule runs against habit: topped beets keep best at 33 to 36°F, and the USDA’s storage handbook says 32 to 34°F brings more black spot and rot. Most root crops reward a colder fridge. Beets don’t. This page covers the pulling and storing side of Growing Beets in Illinois.
The short answer
Start with the ground. Illinois’s official state soil is the Drummer series, a Mollisol, the deep, dark prairie soil that built the Corn Belt. USDA’s representative surface values for it read 8 percent sand, 31 percent clay and 61 percent silt, with organic matter around 5.5 percent and a pH of about 6.7, which is near neutral. Drainage class: poorly drained. For a beet, that is a mixed report card. The fertility and the near-neutral pH are friendly. The texture is not what Utah State University Extension describes as ideal, which is deep, sandy, well-drained soil rich in organic matter. Drummer has the organic matter and the depth, but very little sand, and it holds water instead of shedding it.
One caution before going further. A state spans hundreds of soil series, and Drummer is a starting point, not a diagnosis. River bottoms, hill country and any lot a builder has scraped or filled will behave differently, and those figures describe the mapped surface layer of the series, not a worked garden bed. A soil test gives your own numbers. The same Extension source says to add no more than 1 inch of composted organic matter per 100 square feet, which matters on ground that is already dark and rich.
Then there is heat. The source says temperatures above 85 F combined with water stress make the root woody. How many days a year the reference station passes 90 F is not published in the figures behind this page, so I won’t guess one. The logic is simple enough, though: 90 F sits above the 85 F line, so any 90-degree afternoon in a dry spell counts against the crop. Woodiness is a late-season failure, caused by heat plus thirst. It is a different problem from bolting, which comes from thirst in the first six weeks. Keep the two apart, because the fixes differ.
That gives the pulling window. Beets are sown in place, so the 60 to 80 days run from seeding, never from a transplant. The reference-station last spring frost falls between April 11 and April 22, according to NOAA NCEI climate normals (the 30 to 70 percent probability band for 32 F). Suburban and rural gardens often see that last frost one to two weeks later, and the figure is a reference point, not a guarantee, so check your own county. Sow 2 to 3 weeks ahead of those dates, which is roughly March 21 to April 8 at the reference station, and the arithmetic puts mature roots around May 20 to June 27. That is the stretch to aim at, ahead of the worst summer heat. Later-sown rows run into it.
The six weeks that decide it here
Water stress in the first six weeks causes premature flowering. That is the bolting rule, and it tells you where to look in an Illinois spring. Sowing 2 to 3 weeks before the last frost puts those six weeks inside a stretch of the calendar that can swing from soggy to bright and dry in days.
Drummer-type ground tends to buffer that swing in one direction. It is poorly drained, so after a wet spell the surface can stay saturated and cold long after the weather has turned. Early on, then, the clay-heavy mapped soil is rarely the thirsty one. The thirst risk sits in the dry stretches that interrupt an otherwise wet season, and more so in raised beds, in sandier pockets, and anywhere the soil sheds water faster than Drummer does. A bed that drains quickly can go from fine to stressed in a few rainless days, and a row of seedlings only a few weeks old has little root to fall back on.
Since bolting traces to early water stress, the practical habit is to watch the weather for gaps instead of watering on a fixed schedule. Rain that comes in one heavy burst and then stops does not carry a young row for six weeks. If the rain gauge says the week was dry, water, and keep the moisture even instead of alternating soak and drought.
The same six weeks cut the other way on wet ground. Seed sown into cold, saturated clay in late March is sitting in the very conditions the drainage class warns about. Waiting for the bed to crumble instead of smear is not a delay, it is part of the timing. Squeeze a handful: if it holds as a slick ball, it is too wet to sow. The 2-to-3-weeks-before-frost guidance is a window, and the later end of it, closer to the last frost, is the safer choice on poorly drained ground. For what else shows up in those weeks, including what chews on the tops, see What Eats Beet in Illinois, and When. And for how the soil itself shapes the root, Beet Soil in Illinois: What the Root Will Meet goes deeper.
What goes wrong here
- Bolting from early thirst. Water stress in the first six weeks after seeding sends the plant to flower. Check rainfall rather than the calendar, and water through dry gaps, especially in raised or fast-draining beds.
- Woody roots from late heat. Heat above 85 F with water stress toughens the root. This is a separate failure from bolting. The remedy is to sow so roots finish before peak summer, then pull on schedule instead of leaving them to bulk up through a hot, dry stretch.
- Waterlogged, heavy ground. Drummer-type soil is poorly drained and clayey, and beets want well-drained ground. Clay like this tends to compact if worked wet. Raise the bed, work it only when it crumbles, and test your own soil first, since your garden may not be Drummer at all.
- Storing too cold. The source states that at 32 to 34°F more black spot and rot occur than at higher temperatures. Aim for 33 to 36°F at 98 percent humidity for topped roots. In a pit or cellar, stay between 31 F and 41 F.
- Leaving the leaves on. Bunched beets, tops attached, keep about 10 to 14 days at 32 F and above 98 percent relative humidity, and no longer. Top them first if you plan to store them.
- Saving the small roots. Large roots keep much better because they lose water and shrivel more slowly. Eat the small ones first and send the big ones to storage.
Common questions
How many days from seeding until I can pull beets in Illinois?
Plan on 60 to 80 days from seeding. Beets are sown directly where they grow, so the count never starts from a transplant. With a reference-station last frost between April 11 and April 22, sowing 2 to 3 weeks ahead lands the harvest roughly between May 20 and June 27. Gardens farther out often run a week or two later.
Is it safe to leave beets in the ground to get bigger?
The sources behind this page give no pull-size, so I can’t name one. What they do say is that heat above 85 F with water stress makes the root woody. A root left to bulk up through a dry, hot stretch can end up tough, so pulling on schedule is the safer bet. Bigger roots do store better, which is the reason to keep the largest for the cellar.
What temperature should I store beets at?
Topped roots belong at 33 to 36°F with 98 percent humidity. Colder is not better: at 32 to 34°F, the USDA handbook records more black spot and rot than at slightly warmer temperatures. For pits and cellars, the range to stay inside is 31 F to 41 F.
Do I have to cut off the tops before storing?
Yes. Bunched beets with leaves attached last only 10 to 14 days at 32 F and above 98 percent relative humidity, and the source treats that as the ceiling. Topped roots are the ones meant for longer storage, as described in USDA Agricultural Handbook 66. That handbook was written for commercial storage, so a home refrigerator or cellar will rarely hit its numbers exactly, but the direction holds: slightly above freezing, very humid, tops off, big roots saved and small ones eaten first.