Pull beets 60 to 80 days after seeding, counting from the day the seed went into the ground, since beets are sown in place and never transplanted. In the Whitehorse area, where the average last spring frost falls on June 5, a sowing in the second half of May points to a harvest from mid-July to about August 10. Storage runs against the usual root-crop advice. Topped beets keep best at 33 to 36 F, and the 32 to 34 F range produces more black spot and rot.
The short answer
Start with the ground. Agriculture and Agri-Food Canada’s soil survey of Yukon’s mapped agricultural areas finds the Brunisol is the most common soil order, covering 41 percent of the mapped surface, with Gleysolic soils next. A Brunisol is a young soil whose horizons are only beginning to separate, typical of recent or coarse parent material. Canada has no official provincial soil series the way a US state does, so this is the dominant profile rather than one emblematic soil. The median surface horizon is a loam: 47 percent sand, 15 percent clay and 38 percent silt, with a pH of about 6.8 (near neutral), organic matter around 12.0 percent, and imperfect drainage.
Set that against what Utah State University Extension says a beet wants: deep, sandy, well-drained soil rich in organic matter. Yukon’s typical profile gets most of it right. The sand fraction is generous for a loam, the pH sits near neutral, and the organic matter is high. Drainage is the weak point. “Imperfectly drained” means water lingers in the profile after rain or snowmelt, and a beet root sitting in slow-draining ground is a poor bet. The same extension source caps compost at 1 inch per 100 sq ft, and on ground already near 12.0 percent organic matter that cap is a ceiling rather than a target. Many gardens could skip the compost entirely. The Beet Soil in Yukon: What the Root Will Meet page goes deeper on what the root meets as it sizes up.
Treat all of this as a starting point. A territory spans hundreds of soil series, and the survey covers only the agricultural regions, so the far north isn’t represented. River bottoms, muskeg and any lot a builder has scraped or filled can differ completely from the median. The pH of 6.8 is the median of mapped soils, not your pH. A soil test on your own bed gives you the number that counts.
Heat is the second half of the question. The number of days a year Whitehorse passes 90 F is not published in the data behind this page, and guessing would be worse than leaving it blank. What the extension source does give is a threshold: heat above 85 F combined with water stress makes the root woody. Both conditions have to occur together. A hot spell on a well-watered bed is a different situation from a hot spell on a bed that has dried out. Woodiness is a late-season failure of the root itself, and it has nothing to do with the early-season flowering problem covered next.
The six weeks that decide it here
Where the frost window puts your sowing
Sowing 2 to 3 weeks before the last frost is the usual advice for beets. With an average last frost of June 5, that works out to roughly May 15 to May 22. That date comes from Environment and Climate Change Canada’s climate normals for the WHITEHORSE A station, and it is a mean, not a safe date. In one year out of two, frost falls later than June 5. Think of it as the midpoint of a window. The station is also one point in a large territory, and northern or upland districts run weeks behind it. If your garden sits higher or farther north than the airport, shift everything later.
The first six weeks after sowing then run from about mid-to-late May to late June or the first days of July (June 26 to July 3, by simple arithmetic). Those weeks are the ones that decide whether the crop bolts.
Where the bolting risk sits
Utah State University Extension states that water stress in the first six weeks causes premature flowering. A beet that flowers in its first season has put its energy into a seed stalk, and the root suffers for it. So the question is whether those six weeks are likely to be dry. Whitehorse sits in a dry interior climate, and spring there tends to swing between warm, bright days and cold nights. The precipitation record is not part of the verified data here, so treat “dry” as the working assumption and not as a measured fact. Bolting risk therefore sits in late May and June, when the seedbed surface dries fastest and the seedlings have the shallowest roots.
The soil helps somewhat. A loam with high organic matter holds more water than plain sand, which buys some margin. But the top inch where the seed sits dries out first regardless of what lies below. Even moisture through the first six weeks matters more than heavy watering later. Beets sown in the window, thinned in place and kept evenly moist, reach the 60 to 80 day mark between mid-July and about August 10. A later sowing pushes that date back by the same number of days. The date of the first fall frost is not published here, so check a local source before planning a late crop around it.
Cold snaps are the other hazard of a mid-May sowing, since frost after June 5 happens in about half of years. A light cover over the row on a frosty night is cheap insurance. The Growing Beets in Yukon page covers the full season, and What Eats Beet in Yukon, and When covers what shows up once the leaves are up.
What goes wrong here
Most failures trace back to one of four causes: thirst early, heat later, slow drainage, or storage temperatures set too low.
- Bolting. Water stress in the first six weeks sends the plant to flower. Keep the seedbed evenly moist from sowing through late June or early July, and mulch lightly once seedlings are up so the surface does not bake dry.
- Woody roots. This is a separate problem. Heat above 85 F combined with water stress toughens the root later in the season. Water through hot spells so the bed never dries out while the thermometer is high.
- Frost on young seedlings. A mid-May sowing runs ahead of an average last frost of June 5, and frost comes later than that in one year out of two. Keep a cover on hand rather than waiting for a safe date.
- Wet feet. The typical profile is imperfectly drained, and Gleysolic soils are the second most common. If water stands in your bed after rain, build it up a few inches or choose higher ground.
- Too much compost. The extension limit is 1 inch per 100 sq ft. With surface organic matter near 12.0 percent in the typical profile, test first and add little or none.
- Storing too cold. USDA Agricultural Handbook 66 reports more black spot and rot at 32 to 34 F than at a slightly warmer setting. Hold topped roots at 33 to 36 F and 98 percent humidity, and keep pits and cellars between 31 and 41 F.
- Leaving the tops on. Bunched beets with leaves last only 10 to 14 days at 32 F and above 98 percent humidity. Top them first, then store.
- Keeping the small ones. Large roots keep much better because they lose water and shrivel more slowly. Eat the small roots first and store the big ones.
Common questions
How many days from seeding to pull beets in Yukon?
Count 60 to 80 days from seeding, never from a transplant. For a sowing between May 15 and May 22, that is roughly July 14 to August 10.
Is June 5 a safe date to sow?
No. June 5 is the average last frost at Whitehorse A, so frost lands later in one year out of two. Sowing 2 to 3 weeks earlier is common practice, but have a cover ready. Northern and upland gardens run weeks behind the station.
Why not store beets as cold as possible?
USDA Agricultural Handbook 66 says more black spot and rot occur at 32 to 34 F than at higher temperatures. Topped roots do best at 33 to 36 F and 98 percent humidity, and pits and cellars should stay between 31 and 41 F. The handbook is at ars.usda.gov.
Does Yukon soil suit beets as it is?
The typical mapped profile is a near-neutral loam with plenty of organic matter, but imperfectly drained. Your own bed may differ, so run a soil test before amending.