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The best time to plant rhubarb in Minnesota is in early spring, as soon as the ground can be worked, typically between mid-April and early May.
When you plant rhubarb in Minnesota during this window, the crowns have time to establish strong roots before summer heat arrives.
While spring is the prime season, you can also plant rhubarb in Minnesota in the fall, roughly six weeks before the first hard frost, usually by mid-September.
Knowing when to plant rhubarb in Minnesota makes all the difference because this perennial vegetable thrives in cool soil and needs that chilly dormancy period.
In this post, we’ll cover the ideal timing for planting rhubarb in Minnesota, why the timing matters so much, and the best practices to get your rhubarb patch thriving in the North Star State.
Let’s dig into the details of Minnesota rhubarb planting so you can enjoy those tangy stalks for decades to come.
When to Plant Rhubarb in Minnesota for Best Results
The question of when to plant rhubarb in Minnesota really comes down to soil temperature and frost dates.
Rhubarb is a cold-hardy plant that actually requires a winter chill to produce well, so timing your planting right is crucial.
In Minnesota’s USDA hardiness zones (mostly zones 3 through 5), the ground typically thaws and becomes workable in late April.
If you plant rhubarb too early while the soil is still frozen or waterlogged, the crowns may rot.
If you wait too long into May, the heat can stress the young plants and stunt their first-year growth.
Here are the key factors for deciding when to plant rhubarb in Minnesota this season.
1. Watch the Soil Temperature, Not Just the Calendar
When you plant rhubarb in Minnesota, the soil temperature should be at least 40°F (4°C) but ideally around 45°F to 50°F.
You can check this with a simple soil thermometer inserted about 4 inches deep into the garden bed.
In most Minnesota springs, that soil temperature range hits sometime between mid-April and the first week of May.
If the soil is still mucky from snowmelt, wait a few extra days until it drains well.
Planting rhubarb in Minnesota when the soil is too wet is a common mistake that leads to crown rot, so patience pays off.
2. Fall Planting for the Brave and Organized
While spring is the most popular answer for when to plant rhubarb in Minnesota, fall planting also works if you time it right.
Aim to plant rhubarb in Minnesota around September 1st to September 15th, giving the roots at least six weeks to settle in before the ground freezes.
Fall-planted rhubarb goes dormant quickly, but those few weeks of root growth help it burst out of the ground faster next spring.
Just make sure to mulch heavily with straw or leaves after the ground freezes to protect the young crowns from harsh Minnesota winter temperature swings.
If you ask local gardeners about when to plant rhubarb in Minnesota, most will still recommend spring because it’s more forgiving.
3. Avoid the Mid-Summer Trap
You should never plant rhubarb in Minnesota during the hot summer months like June, July, or August.
Rhubarb simply does not tolerate heat stress when it’s trying to establish new roots.
If you plant rhubarb mid-summer, the leaves will wilt, growth will stall, and the crown may even die back completely.
This is why the timing question of when to plant rhubarb in Minnesota is so important to get right the first time.
Rhubarb is a long-lived perennial, so a mistake in planting time means you’re fighting a bad start for a plant that could easily live 15 years.
Steps for Planting Rhubarb in Minnesota Gardens
Once you’ve nailed down when to plant rhubarb in Minnesota, you need to focus on the actual planting method.
You can start rhubarb from bare-root crowns or from potted nursery plants that are 1-year-old.
Bare-root crowns are the most common and affordable option for Minnesota growers.
Here’s how to get those crowns in the ground properly.
1. Choose the Right Spot with Full Sun
Rhubarb needs at least 6 hours of direct sunlight each day to grow strong stalks.
In Minnesota, a south-facing spot near a fence or wall works great because it captures warmth in early spring.
Make sure the soil is rich in organic matter and drains well, since rhubarb hates wet feet.
When you plant rhubarb in Minnesota, you’re committing to a permanent spot because rhubarb doesn’t transplant well once established.
So pick that spot wisely, with room to spread because each crown can reach 3 to 4 feet wide.
2. Plant Crowns at the Right Depth
Dig a hole that’s wide enough to spread out the rhubarb roots without crowding them.
The crown buds should sit just 1 to 2 inches below the soil surface, not deeper.
Planting rhubarb in Minnesota too deep is a classic error that can cause the crown to rot or fail to emerge.
Space multiple crowns at least 3 feet apart to allow for air circulation and future growth.
After placing the crown, backfill with compost-enriched soil and water thoroughly to eliminate air pockets.
3. Water Consistently During the First Year
The first growing season is critical when you plant rhubarb in Minnesota.
Keep the soil evenly moist but not soggy, watering deeply once or twice a week if rain is scarce.
A 2-inch layer of mulch around the plants helps retain moisture and keeps weeds down.
Don’t harvest any stalks during the first year, even if they look big and tempting.
Let the plant build up its energy reserves so that next year you’ll have a bountiful rhubarb harvest.
Common Mistakes When Planting Rhubarb in Minnesota
Even seasoned gardeners slip up on timing and care, so here’s what to avoid.
Understanding when to plant rhubarb in Minnesota isn’t just about the calendar, it’s about reading your specific microclimate.
Every yard in Minnesota can have slightly different frost patterns, so observe your own garden’s quirks.
1. Planting After the Last Frost Date Without Preparation
Even though the last frost usually happens by mid-May in southern Minnesota and late May up north, soil can still be chilly.
If you wait until after the last frost to plant rhubarb, you might miss the ideal cool-soil window.
So prepare your planting hole in early April, then plant rhubarb in Minnesota as soon as the soil warms slightly above freezing.
2. Skipping the Winter Mulch Protection
Minnesota winters can drop to -30°F in the northern parts of the state.
After you plant rhubarb in Minnesota in the spring, that first winter is the most vulnerable time for the young crown.
Apply 4 to 6 inches of straw or shredded leaves around the base after the ground freezes in late November.
This helps prevent frost heaving, where repeated freeze-thaw cycles push the crown out of the soil.
3. Dividing Too Early in the Spring
If you’re moving or dividing an established rhubarb plant from an old Minnesota garden, do it in early spring while still dormant.
You can actually divide and then plant rhubarb in Minnesota at the same time you’d normally plant new crowns.
But avoid dividing in the fall because the divisions won’t have enough time to root before deep freeze sets in.
So, When to Plant Rhubarb in Minnesota Is Clear
You should plant rhubarb in Minnesota in early spring as soon as the soil is workable, typically mid-April to early May.
Fall planting also works if you do it by mid-September with heavy mulching for winter.
The key is to avoid summer planting at all costs because rhubarb needs cool soil to establish strong roots.
When you plant rhubarb in Minnesota with the right timing, you’re set up for a reliable harvest for 10 to 15 years.
Just remember to give your plants full sun, well-drained soil, and plenty of patience in that first year.
Now you know exactly when to plant rhubarb in Minnesota, so grab your garden gloves and get those crowns in the ground this season.