Kentucky · live outlook · refreshes every 3 h

Kentucky sap flow forecast

The next several days for Kentucky'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.

Kentucky highlighted on a map of the maple belt, with its forecast towns (Marion, Shelbyville) marked — Kentucky in the maple beltDots: Marion · Shelbyville

Season opens: late December to early January; typical
Closes: late February; typical

Marion · Crittenden County reports 2,930 of Kentucky's 12,206 taps (24%), the most of any county with published figures (2022 Census of Agriculture).

Forecast for Marion

Updated Nov 10, 8:56 AM EST

2 sap days in the next 6

freeze thaw 32°F

WedNov 11
44° / 69°
0h below · 24h above
No refreeze forecast
Low of 44°F — no refreeze is forecast. An earlier run may continue, then slow; temperature alone cannot rule out flow.
ThuNov 12
44° / 52°
0h below · 24h above
No refreeze forecast
Low of 44°F — no refreeze is forecast. An earlier run may continue, then slow; temperature alone cannot rule out flow.
FriNov 13
32° / 45°
0h below · 22h 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.
SatNov 14
27° / 48°
9h below · 14h above
Classic sap day
Low 27°F, high 48°F — nights in the 20s and days in the 40s: the textbook sap day.
SunNov 15
29° / 52°
7h below · 17h above
Sap likely
Freeze (29°F) then a warm 52°F. A run is possible; watch for a shorter run as the day warms.
MonNov 16
33° / 54°
Run tapering
No overnight freeze (low 33°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.

Shelbyville · Central Kentucky reference point: Shelby County's Blues End Farm hosts Kentucky Maple Day (Kentucky Department of Agriculture, 2026).

Forecast for Shelbyville

Updated Nov 10, 1:26 AM EST

3 sap days in the next 6

freeze thaw 32°F

WedNov 11
41° / 64°
0h below · 24h above
No refreeze forecast
Low of 41°F — no refreeze is forecast. An earlier run may continue, then slow; temperature alone cannot rule out flow.
ThuNov 12
44° / 51°
0h below · 24h above
No refreeze forecast
Low of 44°F — no refreeze is forecast. An earlier run may continue, then slow; temperature alone cannot rule out flow.
FriNov 13
32° / 44°
1h below · 20h 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.
SatNov 14
26° / 46°
11h below · 11h above
Classic sap day
Low 26°F, high 46°F — nights in the 20s and days in the 40s: the textbook sap day.
SunNov 15
25° / 50°
9h below · 15h above
Sap likely
Freeze (25°F) then a warm 50°F. A run is possible; watch for a shorter run as the day warms.
MonNov 16
29° / 53°
Sap likely
Freeze (29°F) then a warm 53°F. A run is possible; watch for a shorter run as the day warms.

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.