Pull beets 60 to 80 days after seeding, before the ground freezes hard, and set the biggest roots aside for storage. Wyoming squeezes that window from both ends: the last spring frost falls between May 7 and May 18 at the reference station, and frost is possible in any month at higher elevations. Once the tops are off, store the roots at 33 to 36 F. Do not chase 32 F. Colder produces more black spot and rot, which is the opposite of what most root crops reward.
The short answer
Start with the ground. The soil USDA lists as representative of Wyoming is the Forkwood series, an Aridisol, which is a dry-climate soil that runs alkaline and often carries salts. The mapped surface layer is loam to silt: 42 percent sand, 20 percent clay, 38 percent silt. Surface pH is about 7.2, near neutral. Organic matter is about 1.5 percent, and the drainage class is well drained. Those are USDA NRCS Soil Data Access figures for the surface horizon of the series as mapped, not a reading from a worked garden bed. A state this size spans hundreds of soil series, so treat this as a starting point. A river bottom, a hillside or a lot a builder scraped will behave differently, and a soil test is the only way to learn your own numbers. Our page on Beet Soil in Wyoming: What the Root Will Meet goes deeper on that.
Here is what that profile means for a beet. Utah State University Extension says beets want deep, sandy, well-drained soil rich in organic matter. Forkwood gets the drainage right and carries a fair share of sand. The 1.5 percent organic matter is the thin spot, because humus is what lets a bed carry moisture through a dry week. Utah State caps compost at no more than 1 inch per 100 square feet, so more is not the fix. The point is that this ground drains freely and holds little in reserve, and timing decisions follow from that.
Heat and the woody root
Utah State also says heat above 85 F combined with water stress makes the root woody. That is a different failure from early bolting, and it shows up late, on roots that stay in the ground into midsummer. How many days a year the reference station passes 90 F is not published in the verified data behind this page, and guessing would be worse than leaving it out. But 90 F is already past the 85 F line, so any hot spell on a dry bed counts.
Counting from the seed
Beets are sown in place, so the 60 to 80 days run from seeding, never from a transplant. Sow two to three weeks before the last frost and you are seeding from roughly mid-April to early May. Counting forward puts first pulls in mid-June and the last in late July. A bed seeded at the early end is mostly finished before the worst heat. A bed seeded late, then left to size up, is the one that turns woody.
For a storage crop, the logic reverses on size. Large roots keep much better than small ones because they lose water and shrivel more slowly (USDA Agricultural Handbook 66). Eat the small ones first and store the big ones. Top them before storing. Bunched beets with leaves keep only 10 to 14 days. The same handbook puts topped roots at 33 to 36 F and 98 percent humidity, and notes that storage at 32 to 34 F brings more black spot and rot than slightly warmer air does.
The broader crop picture is in Growing Beets in Wyoming.
The six weeks that decide it here
Utah State Extension ties premature flowering to water stress in the first 6 weeks. Seed two to three weeks ahead of the May 7 to May 18 last-frost window and those six weeks run from about mid-April or early May into early or mid June. That is not a calm stretch of Wyoming weather.
What that spring tends to do
Spring on the high plains and in the basins swings. Cold snaps arrive after warm spells, wind dries the surface fast, and moisture comes in uneven pulses. I have no verified rainfall figure for the reference station on this page, so read this as the general character of the season, not a forecast. At roughly 130 frost-free days at 6,000 feet, with frost possible in any month higher up, a beet planted in April is racing a short calendar, and season extension is not optional.
Put that next to the Forkwood profile. Well-drained loam with 1.5 percent organic matter dries out between pulses of moisture, and wind speeds the drying. So the bolting risk sits in the dry gaps of those six weeks, when seedlings go thirsty before the roots are established. Beets bolt early because of thirst in this stretch. They do not get woody because of it. Woodiness is the later problem, from heat above 85 F on a stressed bed.
Making the six weeks count
The plan is steady moisture from seeding through early June. Keep the surface evenly damp until seedlings are up, then water deeply enough that the root zone does not swing wet to dry. A light mulch once seedlings emerge slows the drying. Row cover handles the other swing, the cold snap. Compost within the Utah State limit helps the bed hold water, but it does not replace watering.
Pests join the picture once seedlings are up, and our guide to What Eats Beet in Wyoming, and When covers who shows up and the timing.
What goes wrong here
- Bolting from early thirst. Well-drained loam with little organic matter dries quickly in spring wind, and water stress in the first six weeks sends beets to flower. Remedy: keep moisture even from seeding, add no more than 1 inch of compost per 100 sq ft, and mulch lightly after emergence.
- Woody roots from later heat. Heat above 85 F with water stress toughens the root. This is a separate failure from bolting. Remedy: sow early enough to pull before midsummer, and water deeply during hot spells instead of trying to catch up afterward.
- Frost after sowing. A last frost as late as May 18, and frost possible in any month at higher elevations, can catch young tops. Remedy: sow no more than two to three weeks ahead of the window, and keep row cover ready.
- Ground that is not Forkwood. Alkaline, salty or builder-scraped soil can differ sharply from the state’s representative series, so a pH of about 7.2 is not your pH. Remedy: send in a soil test and amend from your own numbers.
- Storing too cold. Beets held at 32 to 34 F develop more black spot and rot than beets at a little warmer. Remedy: aim for 33 to 36 F at 98 percent humidity, and keep a cellar or pit between 31 F and 41 F.
- Storing bunched or small roots. Leaves on means 10 to 14 days at best, and small roots shrivel faster. Remedy: top them first, eat the small ones fresh, and save the large roots for the cellar.
Common questions
How many days until I can pull beets in Wyoming?
Count 60 to 80 days from seeding. Beets are sown in place, so there is no transplant date to count from. A seeding in mid-April lands first pulls in mid-June, and an early May seeding runs into late July.
What temperature should stored beets sit at, and why not colder?
Topped roots belong at 33 to 36 F and 98 percent humidity. USDA Handbook 66 reports more black spot and rot at 32 to 34 F than at slightly higher temperatures, so near-freezing is not safer for beets. A pit or cellar should stay between 31 F and 41 F.
How long do beets keep with the leaves on?
Bunched beets keep about 10 to 14 days at 32 F and above 98 percent humidity, and no longer. For longer keeping, cut the tops off before storage.
Does the Forkwood soil description match my garden?
Maybe, maybe not. Forkwood is the series USDA lists as representative of Wyoming, but the state spans hundreds of series. Treat its loam texture, near-neutral pH and low organic matter as a starting point, then test your own bed.