Days to maturity from transplant is the number that actually decides this, not the total days from seed printed on the packet — and catalogues mix the two freely. Near Detroit, the last spring frost falls around April 30 and the first fall one lands somewhere between October 6 and October 21, so a mid-May planting leaves roughly five months to work with. Count forward from that date, and the gap between a variety’s ripening and the coming frost tells you exactly how much room you actually have.
What this comes down to in Michigan
Near Detroit, MSU Extension’s frost data gives a growing season that runs from around April 30 for the last spring frost to somewhere between October 6 and October 21 for the first fall frost in zone 6a. That is a window of roughly five months, generous enough that most tomatoes sold through Northern seed catalogues will finish here if they go into the ground on time. The figure that actually decides whether a variety ripens is its days to maturity from transplant, not the seed packet’s total days from seed, and it is worth confirming which one a catalogue is quoting before anything else.
Set transplants out in mid May across the Detroit area, once the soil has warmed and the frost risk has passed, a step covered in our guide to growing tomatoes in Michigan. Count forward from there. The varieties below run from shortest season to longest, so you can see where the line sits for your own risk tolerance. Each margin figure below is the gap between that variety’s first ripe fruit and the start of MSU’s fall frost window, calculated from a mid-May transplant date near Detroit.
Sakura
Sakura needs about 55 days from transplant, the shortest on this list. Set out in mid May, it ripens by early July and carries roughly 90 days of margin before Detroit’s fall frost window opens, more cushion than almost any tomato needs. It is a small round cherry type, good for snacking and for gardeners who want fruit before anything else in the bed.
Sun Gold
Sun Gold runs 57 days from transplant and also lands its first ripe fruit in early July from a mid-May set-out, leaving about 88 days of margin. It carries high resistance to Tobacco Mosaic Virus and Fusarium wilt race 1, useful if either has shown up in the soil before. The fruit is a small orange cherry, sweet enough that most of it never makes it inside.
Supersweet 100
Supersweet 100 needs 60 days from transplant and ripens by mid July from a mid-May start, with about 85 days of margin before the first fall frost. It resists Verticillium wilt and Fusarium wilt race 1 at a high level, both soil-borne problems that build up in beds that grow tomatoes every year. Fruit comes in long clusters of small red cherries over a long indeterminate season.
Juliet
Juliet also needs 60 days from transplant, ripening mid July with roughly 85 days of margin. It carries intermediate resistance to both late blight and early blight, the two fungal diseases that show up most often in a wet Michigan August. The fruit is an elongated grape shape, meaty enough for sauce but small enough to eat whole.
Jasper
Jasper matches Juliet at 60 days from transplant and about 85 days of margin, but adds high resistance to late blight rather than intermediate, worth having in a year when the disease moves through the region early. It is a small round red cherry tomato bred for heavy, continuous production on an indeterminate vine.
Amalfi
Amalfi needs 68 days from transplant, ripening in late July with about 77 days of margin. It is a determinate paste tomato, so the plant sets its fruit over a shorter window rather than trickling out all season, and it carries intermediate resistance to nematodes, late blight, and early blight. That combination suits a bed with a history of foliar disease.
Cherokee Purple
Cherokee Purple needs 72 days from transplant and ripens in late July, with about 73 days of margin, comfortable in a Detroit-area season but tighter than the cherry types above. It carries no listed disease resistance, so it depends on crop rotation and airflow rather than genetics to stay clean. The fruit is a large, dusky purple-pink beefsteak grown for flavor over yield.
Big Beef Plus
Big Beef Plus also needs 72 days from transplant and carries the same 73-day margin as Cherokee Purple, but adds intermediate resistance to nematodes and high resistance to gray leaf spot and Tomato Mosaic Virus. It is a large red slicing tomato on an indeterminate vine, a reasonable substitute where Cherokee Purple’s lack of resistance is a concern.
Tiren
Tiren needs 75 days from transplant, ripening late July with about 70 days of margin. It carries high resistance to Verticillium wilt, Tomato Mosaic Virus, and Fusarium wilt race 1, a strong disease package for an oval red plum tomato used mostly for sauce and canning.
Granadero
Granadero matches Tiren’s 75 days and 70-day margin, with high resistance to Verticillium wilt and Tomato Mosaic Virus plus intermediate resistance to nematodes. It is a roma-type paste tomato with a uniform, blocky shape that holds up well through canning.
San Marzano II
San Marzano II needs 78 days from transplant, ripening late July with about 67 days of margin, the tightest fit among the paste types listed here. It is a long, slender plum tomato bred for sauce, and it carries no listed disease resistance, so a longer, wetter August raises the risk of losing fruit to blight before it finishes.
Celebrity Plus
Celebrity Plus also needs 78 days and shares the 67-day margin, but it is determinate rather than indeterminate, so the plant sets most of its crop in one flush instead of spreading it over the season. It carries intermediate resistance to nematodes and high resistance to gray leaf spot and Tomato Mosaic Virus, a useful pairing for a compact slicing tomato.
Brandywine
Brandywine needs 78 days from transplant as well, with the same 67-day margin, and carries no listed disease resistance. It is a large, pinkish-red beefsteak heirloom grown for flavor, and that combination of a tight margin and no genetic backup makes it one of the varieties worth watching closely in a cool, late spring.
Amish Paste
Amish Paste is the longest-season variety on this list at 85 days from transplant, ripening in early August with about 60 days of margin before Detroit’s fall frost window opens. That is still workable most years, but it is the cultivar with the least buffer to work with if a spring runs cold. It is a large, oxheart-shaped red paste tomato, an heirloom favorite for canning.
| Variety | Days from transplant | Fruit type | Margin before fall frost* |
|---|---|---|---|
| Sakura | 55 | Cherry | 90 days |
| Sun Gold | 57 | Cherry | 88 days |
| Supersweet 100 | 60 | Cherry | 85 days |
| Juliet | 60 | Grape | 85 days |
| Jasper | 60 | Cherry | 85 days |
| Amalfi | 68 | Paste | 77 days |
| Cherokee Purple | 72 | Beefsteak | 73 days |
| Big Beef Plus | 72 | Slicer | 73 days |
| Tiren | 75 | Plum | 70 days |
| Granadero | 75 | Paste | 70 days |
| San Marzano II | 78 | Paste | 67 days |
| Celebrity Plus | 78 | Slicer | 67 days |
| Brandywine | 78 | Beefsteak | 67 days |
| Amish Paste | 85 | Paste | 60 days |
*Margin calculated from a mid-May transplant date against MSU Extension’s fall frost window for the Detroit area. Other parts of the state run on a different schedule, covered below.
Working it out for your own garden
The method behind every date above is simple. Take the frost-free window MSU Extension publishes for your area, subtract the variety’s days to maturity, and see what is left. For the Detroit area, that window runs from around April 30 at the start to somewhere between October 6 and October 21 at the end. Subtract a range from a range and the result is another range, not a single day, so treat any date calculated this way as an estimate good to within a week or so either direction. The full arithmetic for setting a transplant date is worked through in our Tomato Planting Dates in Michigan guide.
A variety that finishes comfortably
Take Big Beef Plus, at 72 days from transplant. Set it out in mid May, once the soil has warmed enough to avoid setting the plant back, and it ripens by late July. Count forward from late July to the start of the fall frost window in early October and there is about 73 days of slack, more than two months of room for a slow year, a stalled blossom set, or a stretch of cool nights that pushes ripening back a week or two.
A variety where the margin gets thin
Now take Amish Paste, at 85 days from transplant, the longest on the list. From the same mid-May set-out it does not ripen until early August, and the gap to the first fall frost narrows to about 60 days near Detroit. That is workable in a normal year, but it is the kind of margin that shrinks fast in a shorter-season part of the state. Toward the north, where USDA’s hardiness map puts conditions as cold as zone 4a, the same 60-day cushion built on Detroit’s numbers may not exist at all, and a variety this long can run out of season before it finishes. The same subtraction works for any tomato under consideration, not just the ones listed here: find the days-to-maturity printed on the packet, run it against the local frost window, and treat the answer as a planning range rather than a promise.
What changes across the state
Every figure above is anchored to the Detroit area, and Michigan is too long and too shaped by the Great Lakes for one city’s frost dates to hold statewide. USDA’s Plant Hardiness Zone Map, built on 1991-2020 climate normals, spans zone 4a to zone 6b across the state, a difference of roughly two full zones between the coldest pockets and the mildest. That range alone signals a season length that varies by weeks, not days, from one county to the next.
Lake Michigan and Lake Huron both moderate the counties closest to their shorelines, delaying the last spring frost and pushing back the first fall frost compared with inland spots at the same latitude. Move away from the water, and the swing between a warm afternoon and a cold night widens, raising the odds of a late frost catching a bed that looked safe a week earlier.
Elevation and simple latitude do the rest. Northern counties, particularly in the Upper Peninsula, sit at the coldest end of that zone 4a to 6b range and carry a noticeably shorter frost-free season than southeast Michigan. A grower there should treat every margin figure in this article as smaller than it actually is near Detroit, and lean toward the shorter end of the varieties listed above rather than the 78 to 85 day group. Southern counties near the Ohio border, by contrast, often see a longer season than Detroit itself, which gives some room to push a longer-season paste tomato that would be a stretch further north.
The mistakes this state punishes
The most common mistake is planting into soil that is still cold after a run of warm days fools a gardener into thinking it is safe. A few warm afternoons in April do not mean the soil four inches down has caught up, and a transplant set into cold soil sits stalled for a week or two instead of growing, quietly eating into the margin calculated above. Wait for settled warmth, not just a warm forecast, before setting transplants out.
The second mistake is choosing a variety on days-to-maturity alone without checking it against the actual frost window for the specific part of the state. An 85-day paste tomato that works fine near Detroit can run out of room in a shorter, colder season further north, and a gardener who picks it because a catalogue calls it a good canning tomato, without running the subtraction, finds out only when the fruit is still green at the first hard freeze. Match the variety to the season before falling for the description.
The third is timing pest management around the calendar instead of around the plant. Several pests that show up on Michigan tomatoes arrive at a fairly predictable point in the season, and missing that window means treating after the damage is done rather than before it starts. The specifics of which pests to expect and when belong to Tomato Pests in Michigan: Which Ones Actually Show Up Here, but the mistake worth flagging here is treating variety choice and pest pressure as separate problems, when a resistant cultivar like several listed above removes one risk before the season even starts.
Checking this against your county
Every number in this article comes from data centered on the Detroit area, and it is a starting point, not a guarantee for your own yard. Check your county’s frost dates and season length against the state’s land-grant extension network before locking in a variety list, since MSU’s own outreach directory covers local offices that track conditions closer to home than a statewide average can. Soil type, wind exposure, and even which side of a hill the beds sit on can shift a local frost date by several days, more than the difference between two neighboring counties on a map. The MSU Extension outreach directory is the right place to start, and a quick call to the office nearest you will usually confirm whether the margins above run wider or tighter where you garden.
Common questions
Can I plant tomatoes in June and still get a harvest in Michigan?
Yes for the shorter-season varieties on this list, since something like Sun Gold or Jasper only needs 55 to 60 days from transplant and still leaves weeks of margin before the fall frost window near Detroit. A June planting of an 85-day variety like Amish Paste is far riskier, since it pushes ripening close to the frost window with little room for a cold stretch.
Does determinate mean it ripens faster than indeterminate?
Not necessarily. Days to maturity is the number that decides ripening speed, not growth habit. A determinate variety like Celebrity Plus sets most of its fruit in one flush rather than trickling out over the season, but it is not automatically faster than an indeterminate one with a similar days-to-maturity figure.
My seed packet only lists days from seed, not from transplant, what do I do?
Check the packet for a note on how many weeks the seedling stage takes before that variety is normally set out, since the days-from-seed figure already includes that period and is not comparable to the transplant figures used throughout this article. Every variety listed here is quoted as days from transplant specifically so the frost-window math works directly.
Will a fast-ripening cherry tomato taste worse than a slow heirloom?
Not because of the days-to-maturity number itself. Flavor comes from the variety and the growing conditions, not from how quickly it finishes. Cherokee Purple and Brandywine take longer and are prized for flavor, but short-season types like Sun Gold and Sakura are bred to be sweet, not just early.