In New Brunswick, the frost-free season averages about 132 days, running from a last spring frost around May 23 to a first fall frost around October 2, according to Environment and Climate Change Canada’s 1981-2010 climate normals for the Moncton station. A tomato variety has to finish its first ripe fruit well inside that span, with room left over for a cold spring or an early fall. Check a variety’s days-to-maturity figure against that window before you buy the seed packet, and favor the ones with the widest margin.
What this comes down to in New Brunswick
New Brunswick’s frost-free window, measured at Moncton by Environment and Climate Change Canada, runs on average from May 23 to October 2, a span of roughly 19 weeks. That is the target every variety on this page has to fit inside, and it is a mean, not a promise: in one year out of two, the last spring frost falls later than May 23, and the first fall frost can arrive earlier than October 2. If you haven’t settled the basics of growing tomatoes in New Brunswick yet, this page assumes you have and focuses only on which varieties suit the season.
The early-June transplant date used throughout this page comes from working backward from that frost window, which is covered in detail in Tomato Planting Dates in New Brunswick: Counting Back From Your Frost Window. A variety that ripens with six or seven weeks of margin before the average frost date survives a late spring or an early fall. One that needs every day of the average season does not. The varieties below run from the shortest season to the longest, so you can see exactly where that margin runs out.
Sakura
Sakura is a cherry tomato listed at 55 days from transplant. Set out in early June, it typically produces its first ripe fruit in late July, leaving about 63 days of margin before Moncton’s average frost date, the widest cushion of any variety on this list. It also carries intermediate resistance to nematodes and high resistance to tomato mosaic virus and both common races of fusarium wilt, which matters more in a wet season than the days-to-maturity figure does.
Sun Gold
Sun Gold needs 57 days from transplant and, set out at the same early-June date, starts ripening in early August with about 61 days of margin left before the average frost. It’s a sweet, gold-skinned snacking tomato rather than a slicer, and it carries high resistance to tobacco mosaic virus and to one race of fusarium wilt, both useful in gardens that have grown tomatoes in the same soil for years.
Juliet
Juliet, a grape tomato at 60 days from transplant, ripens its first fruit in early August from an early-June setting, with about 58 days of margin before Moncton’s average frost. It carries intermediate resistance to both early blight and late blight, two diseases that show up in cool, damp New Brunswick summers, which makes it a reasonable choice where fungal pressure has been a problem before.
Amalfi
Amalfi is a paste tomato bred for sauce and canning, listed at 68 days from transplant. Set out in early June, it ripens in mid-August with about 50 days of margin before the average frost, a noticeably tighter window than the cherry tomatoes above it. It’s determinate, so the fruit ripens over a shorter, more concentrated stretch, which suits a canning batch better than a steady trickle of fresh fruit.
Cherokee Purple
Cherokee Purple is a heirloom beefsteak at 72 days from transplant, ripening in mid-August from an early-June setting with about 46 days of margin before Moncton’s average frost. It’s grown for fresh eating rather than sauce or canning, and it carries no listed disease resistance on the seed packet, which is worth weighing against its size and flavor if your garden has had blight problems before.
San Marzano II
San Marzano II is a long, narrow paste tomato at 78 days from transplant, the longest season on this list. Set out in early June, it ripens in late August with about 40 days of margin before the average frost, the narrowest cushion of any variety here. That margin still clears the Moncton average on paper, but it leaves almost nothing spare for a late spring or an early fall.
Celebrity Plus
Celebrity Plus is an all-purpose slicing tomato, also at 78 days from transplant, ripening in late August from an early-June setting with the same roughly 40 days of margin as San Marzano II. It’s determinate and compact, and it carries intermediate resistance to nematodes and high resistance to gray leaf spot and tomato mosaic virus, which offsets some of the risk that comes with running the season this close.
| Variety | Days to maturity | Habit | First ripe (approx.) | Margin before Moncton’s average frost |
|---|---|---|---|---|
| Sakura | 55 | Indeterminate | Late July | 63 days |
| Sun Gold | 57 | Indeterminate | Early August | 61 days |
| Juliet | 60 | Indeterminate | Early August | 58 days |
| Amalfi | 68 | Determinate | Mid August | 50 days |
| Cherokee Purple | 72 | Indeterminate | Mid August | 46 days |
| San Marzano II | 78 | Indeterminate | Late August | 40 days |
| Celebrity Plus | 78 | Determinate | Late August | 40 days |
Working it out for your own garden
The method behind every figure above is simple subtraction, and it works wherever your own frost dates fall. Take Environment and Climate Change Canada’s Moncton normals, a last spring frost averaging May 23 and a first fall frost averaging October 2, and count forward from an early-June transplant date using the days-to-maturity figure printed on the seed packet.
An example that clears the season easily
Sakura is listed at 55 days from transplant. Set it out in early June and count 55 days forward: first ripe fruit lands in late July. From there to Moncton’s average first fall frost of October 2 is roughly 63 days, so Sakura finishes with two months of season still in hand. That kind of margin is what actually protects a harvest from a late spring or an early frost, not the average date itself.
An example that runs the season close
Celebrity Plus needs 78 days from transplant. Set out at the same early-June date, it reaches first ripe fruit around late August, leaving about 40 days before Moncton’s average frost. That’s a pass on paper, but the days-to-maturity figure on any seed packet is measured under nursery conditions and can run a week or two either way depending on the season, and 40 days absorbs that variation far less comfortably than 63 does. Push the transplant date back by even a week, whether from a late spring or a wet, cold June, and that margin narrows fast.
The Moncton normals are a starting point, not a guarantee for the whole province. Northern and upland parts of New Brunswick run their frost dates weeks behind the coast, which shortens the calculation on both ends, and it hits a 78-day variety far harder than a 55-day one.
The mistakes this state punishes
The most common mistake in New Brunswick is treating May 23, Environment and Climate Change Canada’s average last spring frost for Moncton, as a safe planting date rather than a midpoint. A warm stretch in early May convinces a lot of gardeners to set transplants out early, then a normal cold snap in the back half of the month kills them outright. In one year out of two, the last frost falls later than the average, so treat late May as the earliest reasonable date, not the target.
The second mistake is choosing a long-season variety because it looked good in a catalogue photo, without checking its days-to-maturity against the season it actually has to grow in. A 78-day tomato like San Marzano II or Celebrity Plus can still ripen at Moncton, with around 40 days of margin built into an early-June transplant, but that margin belongs to the coast. Grow the same variety somewhere that runs weeks behind Moncton, and the crop can still be green when the first hard frost hits.
The third is stopping the clock at the first ripe fruit. The days-to-maturity figure on a seed packet marks when the first tomato turns color, not when the plant is finished producing. A short-season cherry tomato like Sakura or Edox keeps setting and ripening fruit for weeks after that first one, and the real margin a variety needs is longer than the bare days-to-maturity number suggests, especially on an indeterminate vine that only slows down at frost.
Checking this against your county
Every figure on this page comes from Environment and Climate Change Canada’s climate normals for the Moncton station, and Moncton is not the whole province. Coastal Saint John, the upper Saint John River valley, and the far north of New Brunswick each carry their own frost dates, sometimes weeks apart from Moncton’s. Treat the Moncton window as a starting point for working out your own dates, not as the figure for your own garden. Your county’s agricultural office, or Agriculture and Agri-Food Canada, can point you toward normals from a station closer to home before you commit a season to a long-season variety.
Common questions
Can I grow a 90-day heirloom tomato in New Brunswick?
Not from this list, and probably not without help. The longest catalogue figure among the varieties confirmed here is 78 days, for Celebrity Plus and San Marzano II, and both already run their margin down to about 40 days at Moncton’s average frost dates. A 90-day variety would need either a much warmer microclimate than Moncton’s or a structure like a row cover or greenhouse to add growing days at each end, so check with your county extension office before betting a season on it.
What does “days to maturity” actually count from?
On every variety in this list, it counts from the transplant date, not from when you started seed indoors. That’s the standard catalogue convention and it’s printed on the seed packet, but it matters here because gardeners who count from seeding underestimate how much of the season an indeterminate plant like Sun Gold or Juliet still needs once it’s actually in the ground.
Determinate or indeterminate, does it matter for a short season?
It changes how the harvest is spread, not how fast the first fruit ripens. Determinate varieties like Amalfi and Celebrity Plus set most of their fruit in a shorter window and then taper off, which suits a short season if you want one big batch for canning. Indeterminate varieties like Sakura, Sun Gold and San Marzano II keep flowering and setting fruit until frost, so they need the full frost-free window to pay off even though their first fruit can ripen just as fast.
My transplants went in late this year, do these dates still work?
Not exactly. Every date on this page is calculated from an early-June transplant, and every week that slips past that pushes the first-ripe date back by roughly the same week. A variety with a wide margin, like a 55-day cherry tomato, absorbs a late planting far better than a 78-day paste tomato working off the same Moncton frost window, so a late start is exactly when the shorter-season varieties earn their keep.