Practical planning tools for short growing seasons.
Climate-based onion planting guide for New Glasgow, Nova Scotia
When to Plant Onions in New Glasgow
Onions are usually a dependable crop in New Glasgow. The season is supportive enough that gardeners usually have real flexibility in timing and variety choice, including very early to late varieties.
Typical Planting Window
Strong fit in this climate
Use the planting dates below for onions in New Glasgow.
Start indoors
March 25
Typical planting windowMay 20 – June 3
MethodTransplant
Typical days to maturity95–110
Onions are usually started indoors around March 25 and planted outdoors during the normal local window of May 20 to June 3.
Most varieties need about 95–110 days to reach maturity once they are in the garden.
Onions are usually a dependable choice in New Glasgow. Normal timing and realistic variety choice are usually enough to produce dependable results.
The extra room here is most valuable when gardeners use it to improve finish quality and uniform sizing rather than merely count on maturity.
Best local strategy:
Plant on time, choose the varieties you actually want, and focus on steady growth after transplanting.
Can Onions Mature in New Glasgow?
Growing degree days measure how much useful warmth typically accumulates during the season. For onions, this helps estimate whether local heat accumulation is usually enough for the crop to reach maturity on time.
Available GDD (base 45)2144
Typical crop GDD target1300
Heat margin+844
From the usual planting window, New Glasgow typically provides about 2144 growing degree days for onions. With a typical crop target of 1300, that leaves a heat margin of +844. That heat margin usually gives the crop a dependable buffer, so gardeners have some flexibility in planting date and variety choice without pushing the crop close to the edge.
When Is It Too Late to Plant?
If planting later than usual, this table shows how much growing degree day heat is still available from each point in the season. It is most useful for judging how much flexibility you still have before the crop starts losing margin.
Checkpoint
Remaining GDD
Heat margin
Fit vs typical target
Apr 15
2389
+1089
Comfortable
May 15
2348
+1048
Comfortable
Jun 1
2212
+912
Comfortable
Jun 15
2032
+732
Comfortable
Jul 1
1761
+461
Comfortable
How Different Onion Varieties Affect Results
Most onion varieties can succeed in New Glasgow in a typical year. That gives gardeners room to choose for the kind of harvest they want, not just for minimum maturity speed.
Varieties that often fit well here include:
Walla Walla
— large and popular, but still best when started early enough to build size
Copra
— a dependable storage onion with good all-around practicality
Redwing
— a strong red storage type where the season is reasonably supportive
Patterson
— a solid keeping onion that wants enough runway to size up well
Ailsa Craig
— more exposed in shorter seasons because it benefits from a longer finishing run
Best Onion Varieties for New Glasgow
Mid-season onion varieties are usually the strongest all-around match in New Glasgow. The local season can support onions, so the main choice is usually about bulb size, sweetness, color, and keeping quality.
June 10
local season starts
September 22
frost pressure returns
Less heat used2144 GDD available
Hover or tap the dots to see which recommended varieties use that much local heat.
For New Glasgow, start with Redwing and Patterson for onions when you want red storage onions or long-keeping onions.
Choose Walla Walla when you want large sweet onions.
Look at Ailsa Craig and Copra when you specifically want large exhibition onions or dependable storage onions.
Compare each variety’s heat need and maturity timing against the local frost-free window before choosing what to grow.
Recommended starting point
RedwingMid-season
1300 GDD needed2144 available before frost
June 10September 22
Comfortable fit
Why this fit?
Local season fit:
Redwing leaves about 844 GDD cushion against the normal New Glasgow crop heat estimate.
Best for: red storage onions.
A strong red onion that makes sense where the season is supportive enough for good bulb sizing.
Tradeoff: Needs a supportive season for good bulb sizing.
PattersonMid-season
1300 GDD needed2144 available before frost
June 10September 22
Comfortable fit
Why this fit?
Local season fit:
Patterson leaves about 844 GDD cushion against the normal New Glasgow crop heat estimate.
Best for: long-keeping onions.
A solid keeping onion that wants enough runway to size up well before the season closes.
Tradeoff: Needs enough runway before the season closes.
Fastest / most cushion
Walla WallaVery early
1100 GDD needed2144 available before frost
June 10September 22
Comfortable fit
Why this fit?
Local season fit:
Walla Walla leaves about 1044 GDD cushion against the normal New Glasgow crop heat estimate.
Best for: large sweet onions.
A large, popular onion that can be rewarding, but still needs an early enough start to build size.
Tradeoff: Needs an early enough start to build size.
Also realistic
Ailsa CraigLate
1400 GDD needed2144 available before frost
June 10September 22
Comfortable fit
Why this fit?
Local season fit:
Ailsa Craig leaves about 744 GDD cushion against the normal New Glasgow crop heat estimate.
Best for: large exhibition onions.
A large onion that is more exposed in shorter seasons because it benefits from a longer finishing run.
Tradeoff: More exposed in shorter seasons.
CopraEarly
1200 GDD needed2144 available before frost
June 10September 22
Comfortable fit
Why this fit?
Local season fit:
Copra leaves about 944 GDD cushion against the normal New Glasgow crop heat estimate.
Best for: dependable storage onions.
A practical storage onion with good all-around usefulness when started early.
Tradeoff: Still needs enough season to size up.
GDD comparisons are a planning shortcut, not a guarantee. Soil, watering, sowing depth, pests, transplant quality, and harvest goals still affect the final result.
Variety class
Typical days to maturity
Typical GDD need
Local fit
Very early
90–95
1100
Good fit
Early
95–105
1200
Good fit
Mid-season
105–115
1300
Good fit
Late
115–120
1400
Good fit
Main risk: The most common problems here are practical ones: planting too late, losing momentum early, or choosing varieties that ask for more season than necessary.
How Frost Affects Planting Dates for Onions in New Glasgow
New Glasgow usually has about 104 frost-free days, with a typical last spring frost around June 10 and a typical first fall frost around September 22.
Typical last spring frostJune 10
Typical first fall frostSeptember 22
Typical frost-free days104
Minimum safe temperature28°F /
-2
°C
Onions are generally
lightly frost tolerant
and temperatures below about 28°F (
-2
°C) can slow growth or damage plants.
Onions are usually tolerant enough of cool conditions that frost dates act more like planning markers than hard limits. In practice, timing and steady early growth matter more than avoiding every light frost.
The most common setbacks here are practical: planting too late, losing momentum early, or choosing varieties that ask for more season than necessary.
In New Glasgow, onions usually have a solid seasonal margin when planted around May 20. The warmest garden spots are usually south-facing walls, sheltered gardens, raised beds, and sunnier urban lots. Cooler spots like low spots, exposed sites, and shadier yards tend to warm up later and usually provide less heat. For onions, warmer garden spots usually improve early growth and can make timing a little more forgiving.
Set up onions for sizing, watering, and storage
The biggest gains usually come from better planting setup, steady moisture, good sizing, and clean harvest handling rather than season extension.
Soil and planting setup
For storage crops, the best gains usually come from strong early growth and a clean finish.
