Maine sap flow forecast

The next several days for Maine'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.

Somerset County holds 1,685,551 of Maine's 1,946,642 taps (86.6%; 2022 Census of Agriculture); Jackman is the Somerset town Cornell used as a Maine example in its maple-season climate study.

Forecast for Jackman

Updated Sep 26, 5:43 AM EDT

It's the off-season. Sap needs freezing nights, and there are none in sight. Maine's season usually opens around March 4 — 159 days from now.

No freeze-thaw days in the forecast

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

SunSep 27
62°high
47°low
0h frozen
24h thawed
No freeze, no run
Low of 47°F — trees need a hard freeze to reload. No freeze, no run.
MonSep 28
54°high
47°low
0h frozen
24h thawed
No freeze, no run
Low of 47°F — trees need a hard freeze to reload. No freeze, no run.
TueSep 29
58°high
48°low
0h frozen
24h thawed
No freeze, no run
Low of 48°F — trees need a hard freeze to reload. No freeze, no run.
WedSep 30
65°high
47°low
0h frozen
24h thawed
No freeze, no run
Low of 47°F — trees need a hard freeze to reload. No freeze, no run.
ThuOct 1
69°high
48°low
0h frozen
24h thawed
No freeze, no run
Low of 48°F — trees need a hard freeze to reload. No freeze, no run.
FriOct 2
65°high
50°low
0h frozen
21h thawed
No freeze, no run
Low of 50°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.

Oxford County ranks second in Maine with 92,452 taps (2022 Census of Agriculture) and represents southern Maine, where UMaine says the season runs mid-February to early April.

Forecast for Paris

Updated Sep 26, 5:43 AM EDT

It's the off-season. Sap needs freezing nights, and there are none in sight. Maine's season usually opens around March 4 — 159 days from now.

No freeze-thaw days in the forecast

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

SunSep 27
58°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.
MonSep 28
55°high
49°low
0h frozen
24h thawed
No freeze, no run
Low of 49°F — trees need a hard freeze to reload. No freeze, no run.
TueSep 29
62°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.
WedSep 30
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.
ThuOct 1
71°high
50°low
0h frozen
24h thawed
No freeze, no run
Low of 50°F — trees need a hard freeze to reload. No freeze, no run.
FriOct 2
70°high
53°low
0h frozen
21h thawed
No freeze, no run
Low of 53°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 Maine?

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 Maine →

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.