Minnesota · live outlook · refreshes every 3 h

Minnesota sap flow forecast

The next several days for Minnesota'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.

Minnesota highlighted on a map of the maple belt, with its forecast towns (North Branch, Grand Rapids) marked — Minnesota in the maple beltDots: North Branch · Grand Rapids

Season opens: Mar 6; typical
Closes: Apr 6; typical

116 days to the usual opening. When to tap in Minnesota

North Branch · Chisago County has the most taps in Minnesota, 10,667 of 97,822 (2022 Census of Agriculture).

Forecast for North Branch

Updated Nov 10, 7:06 AM EST

4 sap days in the next 6

freeze thaw 32°F

WedNov 11
39° / 47°
2h below · 21h above
No refreeze forecast
Low of 39°F — no refreeze is forecast. An earlier run may continue, then slow; temperature alone cannot rule out flow.
ThuNov 12
27° / 39°
14h below · 9h above
Sap likely
Freeze (27°F) then 39°F — a real freeze-thaw day.
FriNov 13
21° / 38°
17h below · 7h above
Sap likely
Freeze (21°F) then 38°F — a real freeze-thaw day.
SatNov 14
22° / 42°
15h below · 8h above
Classic sap day
Low 22°F, high 42°F — nights in the 20s and days in the 40s: the textbook sap day.
SunNov 15
28° / 44°
9h below · 15h above
Classic sap day
Low 28°F, high 44°F — nights in the 20s and days in the 40s: the textbook sap day.
MonNov 16
34° / 50°
Run tapering
No overnight freeze (low 34°F). Yesterday's favorable weather may allow a run to continue, then slow without a refreeze.

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

Grand Rapids · The northeastern forest counties of St. Louis, Itasca and Carlton hold 17% of Minnesota's taps, and St. Louis County has the most maple farms (2022 Census of Agriculture).

Forecast for Grand Rapids

Updated Nov 10, 6:01 AM EST

2 sap days in the next 6

freeze thaw 32°F

WedNov 11
34° / 40°
0h below · 23h above
No refreeze forecast
Low of 34°F — no refreeze is forecast. An earlier run may continue, then slow; temperature alone cannot rule out flow.
ThuNov 12
24° / 35°
19h below · 4h above
Maybe a light run
A cool 35°F high. The thaw may be too brief for much flow.
FriNov 13
19° / 36°
18h below · 6h above
Maybe a light run
A cool 36°F high. The thaw may be too brief for much flow.
SatNov 14
21° / 38°
16h below · 7h above
Sap likely
Freeze (21°F) then 38°F — a real freeze-thaw day.
SunNov 15
26° / 41°
10h below · 14h above
Classic sap day
Low 26°F, high 41°F — nights in the 20s and days in the 40s: the textbook sap day.
MonNov 16
31° / 47°
Maybe a light run
Only a light freeze (31°F). Branches may not freeze hard enough for a strong run.

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

Your exact spot

Somewhere else in Minnesota?

Share your location for the outlook where your trees actually are. We don't store it.

Your sugarbush, your forecast

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

Nearby

Other states

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.