Wisconsin · live outlook · refreshes every 3 h

Wisconsin sap flow forecast

The next several days for Wisconsin'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.

Wisconsin highlighted on a map of the maple belt, with its forecast towns (Wausau, Medford) marked — Wisconsin in the maple beltDots: Wausau · Medford

Season opens: Mar 15; typical
Closes: Apr 9; typical

125 days to the usual opening. When to tap in Wisconsin

Wausau · Marathon County has the most taps in Wisconsin, 214,538 of 1,272,963 (16.9%; 2022 Census of Agriculture).

Forecast for Wausau

Updated Nov 10, 6:06 AM EST

5 sap days in the next 6

freeze thaw 32°F

WedNov 11
38° / 47°
0h below · 23h above
No refreeze forecast
Low of 38°F — no refreeze is forecast. An earlier run may continue, then slow; temperature alone cannot rule out flow.
ThuNov 12
29° / 39°
11h below · 11h above
Sap likely
Freeze (29°F) then 39°F — a real freeze-thaw day.
FriNov 13
24° / 39°
14h below · 8h above
Sap likely
Freeze (24°F) then 39°F — a real freeze-thaw day.
SatNov 14
23° / 41°
15h below · 9h above
Classic sap day
Low 23°F, high 41°F — nights in the 20s and days in the 40s: the textbook sap day.
SunNov 15
25° / 43°
12h below · 12h above
Classic sap day
Low 25°F, high 43°F — nights in the 20s and days in the 40s: the textbook sap day.
MonNov 16
28° / 47°
Classic sap day
Low 28°F, high 47°F — nights in the 20s and days in the 40s: the textbook sap day.

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

Medford · Taylor County ranks second with 117,898 taps (9.3%; 2022 Census of Agriculture).

Forecast for Medford

Updated Nov 10, 6:16 AM EST

3 sap days in the next 6

freeze thaw 32°F

WedNov 11
37° / 45°
2h below · 21h above
No refreeze forecast
Low of 37°F — no refreeze is forecast. An earlier run may continue, then slow; temperature alone cannot rule out flow.
ThuNov 12
26° / 37°
14h below · 9h above
Maybe a light run
A cool 37°F high. The thaw may be too brief for much flow.
FriNov 13
23° / 37°
16h below · 8h above
Maybe a light run
A cool 37°F high. The thaw may be too brief for much flow.
SatNov 14
22° / 40°
16h below · 8h above
Classic sap day
Low 22°F, high 40°F — nights in the 20s and days in the 40s: the textbook sap day.
SunNov 15
25° / 42°
13h below · 10h above
Classic sap day
Low 25°F, high 42°F — nights in the 20s and days in the 40s: the textbook sap day.
MonNov 16
29° / 46°
Classic sap day
Low 29°F, high 46°F — nights in the 20s and days in the 40s: the textbook sap day.

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

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Your sugarbush, your forecast

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

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Data & method · 4

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

LuckySap · free on iPhone & Android

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 and Android.