Michigan sap flow forecast

The next several days for Michigan's sugaring country, read the way a sugarmaker reads them: how cold the night gets, how warm the afternoon gets, and whether that adds up to a run. The season here usually opens early March.

Menominee County in the Upper Peninsula has the most taps in Michigan, 45,900 (2022 Census of Agriculture).

Forecast for Stephenson

Updated Sep 26, 8:07 AM EDT

It's the off-season. Sap needs freezing nights, and there are none in sight. Michigan's season usually opens around March 5 — 160 days from now.

No freeze-thaw days in the forecast

Blue = below 32°F · Amber = thaw · dashed line = freezing

SunSep 27
71°high
41°low
0h frozen
24h thawed
No freeze, no run
Low of 41°F — trees need a hard freeze to reload. No freeze, no run.
MonSep 28
73°high
46°low
0h frozen
24h thawed
No freeze, no run
Low of 46°F — trees need a hard freeze to reload. No freeze, no run.
TueSep 29
71°high
46°low
0h frozen
24h thawed
No freeze, no run
Low of 46°F — trees need a hard freeze to reload. No freeze, no run.
WedSep 30
69°high
52°low
0h frozen
24h thawed
No freeze, no run
Low of 52°F — trees need a hard freeze to reload. No freeze, no run.
ThuOct 1
69°high
51°low
0h frozen
24h thawed
No freeze, no run
Low of 51°F — trees need a hard freeze to reload. No freeze, no run.
FriOct 2
66°high
44°low
0h frozen
20h thawed
No freeze, no run
Low of 44°F — trees need a hard freeze to reload. No freeze, no run.

Data: National Weather Service. Verdicts use freeze-thaw thresholds from maple field research; your woods may run a little differently.

Charlevoix County made the most syrup of any Michigan county with published figures, 19,405 gallons (2022 Census of Agriculture).

Forecast for Boyne City

Updated Sep 26, 9:11 AM EDT

It's the off-season. Sap needs freezing nights, and there are none in sight. Michigan's season usually opens around March 5 — 160 days from now.

No freeze-thaw days in the forecast

Blue = below 32°F · Amber = thaw · dashed line = freezing

SunSep 27
71°high
44°low
0h frozen
24h thawed
No freeze, no run
Low of 44°F — trees need a hard freeze to reload. No freeze, no run.
MonSep 28
73°high
46°low
0h frozen
24h thawed
No freeze, no run
Low of 46°F — trees need a hard freeze to reload. No freeze, no run.
TueSep 29
74°high
46°low
0h frozen
24h thawed
No freeze, no run
Low of 46°F — trees need a hard freeze to reload. No freeze, no run.
WedSep 30
69°high
53°low
0h frozen
24h thawed
No freeze, no run
Low of 53°F — trees need a hard freeze to reload. No freeze, no run.
ThuOct 1
68°high
54°low
0h frozen
24h thawed
No freeze, no run
Low of 54°F — trees need a hard freeze to reload. No freeze, no run.
FriOct 2
66°high
49°low
0h frozen
21h thawed
No freeze, no run
Low of 49°F — trees need a hard freeze to reload. No freeze, no run.

Data: National Weather Service. Verdicts use freeze-thaw thresholds from maple field research; your woods may run a little differently.

Somewhere else in Michigan?

Your sugarbush, your forecast

Hourly temperatures for your exact spot, turned into a day-by-day sap-run outlook. US and Canada.

Planning ahead? Typical tapping dates for Michigan →

Data & method

National Weather Service API — NOAA National Weather Service
Sap flow in sugar maple: timing and weather drivers (Frontiers in Agronomy, 2025) — de Lima Santos et al.
Maple Sugaring Tips for Beginners and Backyard Maple Sugar Producers — UNH Extension
North American Maple Syrup Producers Manual, 2nd ed. (Bulletin 856) — The Ohio State University Extension

Never miss the first run

LuckySap can ping you the evening before a strong sap day, then keeps your collections, sugar readings, and boils in one season log. Free on iPhone.