Practical planning tools for short growing seasons.

Climate-based bean planting guide for Thompson, Manitoba

When to Plant Beans in Thompson

In Thompson, beans usually has only a narrow seasonal margin, so earlier varieties and good planting timing matter much more than they do for easier crops.

Typical Planting Window

Risky in this climate

Use the planting dates below for beans in Thompson.

Typical planting window June 14 – June 28
Method Direct sow
Typical days to maturity 50–65

Beans are usually sown directly outdoors around June 21, with a typical local planting window of June 14 to June 28. Most varieties need about 50–65 days to reach maturity.

In Thompson, beans are usually a crop that needs active risk management rather than ordinary planting. Gardeners normally need speed, warmth, and a bit of luck all working together.

Compared with many Manitoba locations, Thompson usually reaches the planting season for beans a bit later.

Best local strategy: Treat this crop as a risk-managed project: early timing, warm placement, and quick varieties all matter.

Can Beans Mature in Thompson?

Growing degree days measure how much useful warmth the season provides. For warm-season crops like beans, GDD helps show whether local heat accumulation is usually strong enough for the crop to grow steadily and finish before fall.

Available GDD (base 50) 664
Typical crop GDD target 900
Heat margin -236

From the usual planting window, Thompson typically provides about 664 growing degree days for beans. With a typical crop target of 900, that leaves a heat margin of -236. That heat shortfall means the crop usually needs the fastest approach and the warmest local conditions to have a realistic chance of finishing well.

When Is It Too Late to Plant?

When planting later than usual, this table shows how much growing degree day heat is still available from each point in the season. As planting gets pushed back, the remaining heat drops and the crop becomes less likely to mature on time.

Checkpoint Remaining GDD Heat margin Fit vs typical target
Apr 15 795 -105 Usually short
Jun 1 791 -109 Usually short
Jun 15 743 -157 Usually short
Jul 1 622 -278 Usually short

How Different Bean Varieties Affect Results

In Thompson, very early bean varieties are usually the safest choice because they leave the least room for the season to turn against you. Slower classes are much less forgiving here.

Varieties that often fit well here include:

  • Provider — a dependable early bean often chosen where cool starts and shorter seasons are common
  • Mascotte — compact and relatively quick, making it useful where gardeners want a fast return

Best Bean Varieties for Thompson

Bean variety choice in Thompson is mostly about bush versus pole habit, harvest speed, pod type, plant size, and how much warm-season runway the crop needs.

June 14 local season starts August 28 frost pressure returns
Less heat used 664 GDD available

Hover or tap the dots to see which recommended varieties use that much local heat.

For Thompson, Mascotte and Provider are the most realistic bean options for this short-season fit. They need good timing, steady early growth, and realistic expectations.

Compare each variety’s heat need and maturity timing against the local frost-free window before choosing what to grow.

Closest matches for a marginal season

Mascotte Very early
725 GDD needed 664 available before frost
June 14 August 28
Usually too long
Why this fit?

Local season fit: Mascotte is about 61 GDD short against the normal Thompson crop heat estimate.

Best for: compact early harvests.

A compact bean that gives gardeners a quicker return and works well where space or season length is limited.

Tradeoff: Not the choice for tall pole-bean production.

Provider Very early
725 GDD needed 664 available before frost
June 14 August 28
Usually too long
Why this fit?

Local season fit: Provider is about 61 GDD short against the normal Thompson crop heat estimate.

Best for: early reliable beans.

A dependable early bean that is useful where cool starts, variable conditions, or shorter seasons are common.

Tradeoff: Practical more than specialty.

GDD comparisons are a planning shortcut, not a guarantee. Soil, watering, sowing depth, pests, transplant quality, and harvest goals still affect the final result.

Varieties that didn’t make the cut

These varieties are not the main picks for Thompson because they either run past the normal season or leave too little margin before frost.

fortex Late
Needs 1000 GDD
Thompson gives 664 GDD
Gap 336 GDD short
664 GDD available before frost 336 more GDD needed
June 14 August 28
Runs past season
Why not a main pick?

Local season fit: fortex usually needs about 336 more GDD than Thompson provides before frost.

Best for: high-quality long beans.

An excellent-quality pole bean that is generally happier when warmth and season length are less limiting.

Tradeoff: Needs a supportive warm season.

rattlesnake Late
Needs 1000 GDD
Thompson gives 664 GDD
Gap 336 GDD short
664 GDD available before frost 336 more GDD needed
June 14 August 28
Runs past season
Why not a main pick?

Local season fit: rattlesnake usually needs about 336 more GDD than Thompson provides before frost.

Best for: vigorous pole beans.

A vigorous bean that can be productive, but is better where the season leaves a little more room.

Tradeoff: Needs a longer warm run than early bush beans.

scarlet runner Late
Needs 1000 GDD
Thompson gives 664 GDD
Gap 336 GDD short
664 GDD available before frost 336 more GDD needed
June 14 August 28
Runs past season
Why not a main pick?

Local season fit: scarlet runner usually needs about 336 more GDD than Thompson provides before frost.

Best for: showy edible vines.

A showy and productive runner bean that can be more exposed in shorter or cooler seasons.

Tradeoff: More exposed in short or cool seasons.

blue lake Mid-season
Needs 900 GDD
Thompson gives 664 GDD
Gap 236 GDD short
664 GDD available before frost 236 more GDD needed
June 14 August 28
Runs past season
Why not a main pick?

Local season fit: blue lake usually needs about 236 more GDD than Thompson provides before frost.

Best for: classic green beans.

A classic bean with strong garden appeal when the warm season comfortably supports it.

Tradeoff: Needs a comfortable warm window.

kentucky wonder Mid-season
Needs 900 GDD
Thompson gives 664 GDD
Gap 236 GDD short
664 GDD available before frost 236 more GDD needed
June 14 August 28
Runs past season
Why not a main pick?

Local season fit: kentucky wonder usually needs about 236 more GDD than Thompson provides before frost.

Best for: productive pole beans.

A productive, familiar bean that benefits from a decent stretch of warm weather.

Tradeoff: Needs more time and support than bush beans.

roma ii Mid-season
Needs 900 GDD
Thompson gives 664 GDD
Gap 236 GDD short
664 GDD available before frost 236 more GDD needed
June 14 August 28
Runs past season
Why not a main pick?

Local season fit: roma ii usually needs about 236 more GDD than Thompson provides before frost.

Best for: flat Italian beans.

A reliable Italian-type bean that usually works well when planting is timely and soil is warm.

Tradeoff: Chosen for pod type more than maximum speed.

contender Early
Needs 800 GDD
Thompson gives 664 GDD
Gap 136 GDD short
664 GDD available before frost 136 more GDD needed
June 14 August 28
Runs past season
Why not a main pick?

Local season fit: contender usually needs about 136 more GDD than Thompson provides before frost.

Best for: steady early beans.

An early bean valued for reliability and practical performance in variable garden conditions.

Tradeoff: Less about novelty and more about reliability.

Variety class Typical days to maturity Typical GDD need Local fit
Very early 45–52 725 Tight
Early 50–55 800 Poor fit
Mid-season 55–65 900 Poor fit
Late 65–75 1000 Poor fit

Main risk: The season often runs out before the crop finishes well.

How Frost Affects Planting Dates for Beans in Thompson

Thompson usually has about 75 frost-free days, with a typical last spring frost around June 14 and a typical first fall frost around August 28.

Typical last spring frost June 14
Typical first fall frost August 28
Typical frost-free days 75
Minimum safe temperature 32°F / 0 °C

Beans are generally frost-tender and temperatures below about 32°F ( 0 °C) can slow growth or damage plants.

Beans are much more exposed to frost risk, so the frost dates matter as real planting boundaries rather than rough planning markers.

The crop usually falls short here because the season runs out before it finishes well. Late planting, cool nights, and slower varieties make that problem much worse.

In Thompson, the local season usually leaves only a narrow margin for beans, so microclimate is often part of the strategy rather than a bonus. Season length is often limited by late spring and an early-closing fall window, especially for warm-season crops. The warmest garden spots are usually south-facing walls, raised beds, sheltered backyards, and urban heat pockets. Cooler spots like open windy yards, low frost pockets, and exposed sites that lose heat quickly tend to warm up later and usually provide less heat. For beans, the main gain is faster early growth and a bit more time for pod production before the season fades.

Grow better beans with warm soil and early protection

The most useful supplies are the ones that warm the soil, protect young plants, and prevent a slow start.

Soil warming

When the crop is tight, warm soil matters before the seed even germinates.

Early protection

A little protection can help young plants avoid cold setbacks.

Moisture and establishment

Fast early growth needs steady moisture after sowing.

Recommendations are based on the local growing margin for this crop. As an Amazon Associate, we may earn from qualifying purchases.

Related Crops and Guides

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  • Sweet Corn in Thompson
    Compare local planting timing, frost margin, and season fit for another crop in the same city.
  • Peppers in Thompson
    Compare local planting timing, frost margin, and season fit for another crop in the same city.

Related guides

For a broader local overview, see the Thompson planting guide. You can also use the Growing Degree Day Planner to test planting dates and crop timing.