New Hampshire · live outlook · refreshes every 3 h

New Hampshire sap flow forecast

The next several days for New Hampshire'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.

New Hampshire highlighted on a map of the maple belt, with its forecast towns (Newport, Lancaster) marked — New Hampshire in the maple beltDots: Newport · Lancaster

Season opens: Feb 28; typical
Closes: Apr 7; typical

110 days to the usual opening. When to tap in New Hampshire

Newport · Sullivan County has 192,177 of New Hampshire's 566,187 taps (33.9%), the most in the state (2022 Census of Agriculture).

Forecast for Newport

Updated Nov 10, 5:44 AM EST

2 sap days in the next 6

freeze thaw 32°F

WedNov 11
36° / 50°
0h below · 24h above
No refreeze forecast
Low of 36°F — no refreeze is forecast. An earlier run may continue, then slow; temperature alone cannot rule out flow.
ThuNov 12
32° / 47°
0h below · 21h above
No refreeze forecast
Low of 32°F — no refreeze is forecast. An earlier run may continue, then slow; temperature alone cannot rule out flow.
FriNov 13
35° / 42°
0h below · 24h above
No refreeze forecast
Low of 35°F — no refreeze is forecast. An earlier run may continue, then slow; temperature alone cannot rule out flow.
SatNov 14
30° / 42°
5h below · 17h above
Sap likely
Freeze (30°F) then 42°F — a real freeze-thaw day.
SunNov 15
31° / 45°
2h below · 20h above
Maybe a light run
Only a light freeze (31°F). Branches may not freeze hard enough for a strong run.
MonNov 16
29° / 48°
Classic sap day
Low 29°F, high 48°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.

Lancaster · Coos County in the North Country ranks second with 92,173 taps (16.3%; 2022 Census of Agriculture).

Forecast for Lancaster

Updated Nov 10, 5:44 AM EST

5 sap days in the next 6

freeze thaw 32°F

WedNov 11
30° / 43°
4h below · 16h above
Sap likely
Freeze (30°F) then 43°F — a real freeze-thaw day.
ThuNov 12
26° / 44°
9h below · 15h above
Classic sap day
Low 26°F, high 44°F — nights in the 20s and days in the 40s: the textbook sap day.
FriNov 13
31° / 41°
6h below · 14h above
Maybe a light run
Only a light freeze (31°F). Branches may not freeze hard enough for a strong run.
SatNov 14
25° / 39°
11h below · 11h above
Sap likely
Freeze (25°F) then 39°F — a real freeze-thaw day.
SunNov 15
27° / 40°
12h below · 12h above
Classic sap day
Low 27°F, high 40°F — nights in the 20s and days in the 40s: the textbook sap day.
MonNov 16
25° / 42°
Classic sap day
Low 25°F, high 42°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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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.