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Wisconsin · county maple atlas

Maple sugaring in Trempealeau County, Wisconsin

Trempealeau County had 7 maple operations and 1,000 taps in the 2022 Census. Around Whitehall, sap usually runs from March 12 to April 6. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 157 days until the usual start.
Sap starts
Mar 12
typical year
Season ends
Apr 6
about 4 weeks
Sap days / season
41.3
1991–2026 average
Taps, 2022
1,000
#42 of 60 in WI

Sap-flow outlook at Whitehall right now

Full Wisconsin forecast →

Forecast for Whitehall, WI

Updated Oct 6, 9:06 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Trempealeau County's season usually opens around March 12, which is 157 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    49° / 71°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    44° / 66°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    42° / 68°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    52° / 77°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    60° / 75°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    54° / 64°
    No refreeze forecast

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

When the sap runs

The sugaring calendar at Whitehall

Freeze-thaw weather at Whitehall peaks in the weeks of Mar 2 to Apr 6, which hold about 48% of a season's sap days. March is the busiest month.
Typical season: Mar 12 – Apr 60246Week of Dec 1: 1.3 sap days on averageWeek of Dec 8: 1.6 sap days on averageWeek of Dec 15: 1.3 sap days on averageWeek of Dec 22: 1.2 sap days on averageWeek of Dec 29: 0.6 sap days on averageWeek of Jan 5: 0.9 sap days on averageWeek of Jan 12: 0.7 sap days on averageWeek of Jan 19: 0.5 sap days on averageWeek of Jan 26: 1.0 sap days on averageWeek of Feb 2: 1.3 sap days on averageWeek of Feb 9: 1.4 sap days on averageWeek of Feb 16: 1.9 sap days on averageWeek of Feb 23: 2.0 sap days on averageWeek of Mar 2: 2.6 sap days on averageWeek of Mar 9: 2.8 sap days on averageWeek of Mar 16: 3.9 sap days on averageWeek of Mar 23: 4.0 sap days on averageWeek of Mar 30: 3.5 sap days on averageWeek of Apr 6: 3.1 sap days on averageWeek of Apr 13: 2.2 sap days on averageWeek of Apr 20: 1.7 sap days on averageWeek of Apr 27: 1.0 sap days on averageWeek of May 4: 0.4 sap days on averageWeek of May 11: 0.2 sap days on averageWeek of May 18: 0.1 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Mar 12
Average number of freeze-thaw sap days in each week of the season at Whitehall, 1991–2026. A sap day is an overnight low under 30.2 °F followed by an afternoon high over 37.4 °F. The shaded band is the typical season.

Year-to-year spread

Opening signal
Median Mar 9; the middle half of seasons fell between Feb 27 and Mar 15. Earliest Feb 9 (2024), latest Mar 30 (2013).
Closing signal
Median Apr 9; middle half between Mar 30 and Apr 16. Earliest Mar 11 (2012), latest Apr 29 (2018).
Sap days by month
Dec14%Jan8%Feb16%Mar36%Apr24%May2%

36 seasons of sap weather

Trempealeau County seasons, 1991–2026

The best sap year at Whitehall was 2002 with 61 freeze-thaw days; the leanest was 2015 with 28. Seasons that start early tend to end early too: the trees run on the swing between freezing nights and mild days, and heat ends it.
JanFebMarAprMaysap days20262026: Feb 23 – Mar 29, 39 sap days3920252025: Feb 21 – Mar 27, 47 sap days4720242024: Feb 9 – Mar 16, 59 sap days5920232023: Mar 10 – Apr 8, 51 sap days5120222022: Mar 20 – Apr 20, 45 sap days4520212021: Feb 27 – Apr 3, 45 sap days4520202020: Mar 9 – Apr 13, 50 sap days5020192019: Mar 16 – Apr 20, 36 sap days3620182018: Mar 27 – Apr 29, 57 sap days5720172017: Feb 28 – Apr 2, 35 sap days3520162016: Feb 23 – Mar 30, 39 sap days3920152015: Mar 7 – Apr 4, 28 sap days2820142014: Mar 19 – Apr 23, 29 sap days2920132013: Mar 30 – Apr 25, 30 sap days3020122012: Feb 13 – Mar 11, 39 sap days3920112011: Mar 13 – Apr 8, 35 sap days3520102010: Feb 27 – Mar 30, 31 sap days3120092009: Mar 12 – Apr 16, 40 sap days4020082008: Mar 19 – Apr 16, 32 sap days3220072007: Feb 25 – Mar 23, 38 sap days3820062006: Mar 7 – Apr 9, 33 sap days3320052005: Mar 4 – Apr 3, 37 sap days3720042004: Mar 4 – Apr 7, 40 sap days4020032003: Mar 9 – Apr 13, 43 sap days4320022002: Mar 12 – Apr 10, 61 sap days6120012001: Mar 16 – Apr 19, 32 sap days3220002000: Feb 17 – Mar 21, 48 sap days4819991999: Mar 1 – Mar 30, 44 sap days4419981998: Feb 27 – Mar 25, 37 sap days3719971997: Mar 13 – Apr 17, 41 sap days4119961996: Mar 19 – Apr 22, 48 sap days4819951995: Mar 9 – Apr 11, 42 sap days4219941994: Mar 12 – Apr 11, 45 sap days4519931993: Mar 19 – Apr 22, 42 sap days4219921992: Mar 15 – Apr 15, 50 sap days5019911991: Mar 2 – Apr 1, 39 sap days39
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Whitehall. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Trempealeau County in the Census of Agriculture

USDA counts maple operations every five years. In Trempealeau County the 2022 Census found 7 farms making syrup (+133% since 2017), with taps +18% and syrup output +51% over the same five years. That works out to about 0.16 gallons of syrup per tap in 2022 (0.13 in 2017). Among the 385 counties in this atlas, Trempealeau County ranks 283 by taps.

Trempealeau County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
202271,0001620.16
201738501070.13

Nearby

Neighboring maple counties

Distances are between reference towns; typical dates are each county's own estimate.

About these numbers

The season dates are estimated from 36 seasons of daily high and low temperatures for the PRISM 4-km grid cell at Whitehall (843ft), scored with the same freeze-thaw rule as our live forecast: a sap day is an overnight low under 30.2 °F followed by an afternoon high over 37.4 °F. Each season's closing signal is the last sap day before accumulated warmth reaches a threshold, and the opening signal sits five weeks before that, never earlier than the first real freeze-thaw week. Tested against 117 state-seasons of USDA-reported dates, the rule lands within 5.5 days of the reported close and 6.6 days of the reported opening on average, and the typical dates shown here are scaled to Wisconsin's USDA record (12 years). Production figures are copied from the Census as published. Full method, calibration tables and the downloadable dataset →

Sources · 6

  1. 1.2022 Census of Agriculture, County Level Data — Wisconsin, Table 37: Maple Syrup, 2022 and 2017 · USDA National Agricultural Statistics Service
  2. 2.PRISM daily temperature grids (AN81d, 4 km), accessed 2026-10-05 · PRISM Group, Oregon State University, https://prism.oregonstate.edu
  3. 3.Applied Climate Information System (ACIS) web services · NOAA Regional Climate Centers
  4. 4.USDA NASS maple syrup reports — approximate average season opened and closed dates, 2011–2022 · USDA National Agricultural Statistics Service (mirrored by the University of Vermont)
  5. 5.Sap flow in sugar maple: timing and weather drivers (Frontiers in Agronomy, 2025) · de Lima Santos et al.
  6. 6.GeoNames gazetteer (cities500), CC BY 4.0 · GeoNames

FAQ

Trempealeau County sugaring questions

When should I tap maple trees in Trempealeau County, Wisconsin?
In a typical year the sap starts running around March 12 near Whitehall and the season winds down around April 6. Have your taps in a day or two before the first forecast string of freezing nights and 40 °F days. In the past 36 seasons the weather signal came as early as Feb 9 and as late as Mar 30.
How much maple syrup does Trempealeau County produce?
The 2022 Census of Agriculture counted 7 maple operations in Trempealeau County with 1,000 taps producing 162 gallons of syrup, ranking 42 of 60 Wisconsin's counties with published tap counts.
How many sap days does Trempealeau County get in a season?
On average 41.3 freeze-thaw sap days from December through May at Whitehall, of which about 10 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2002 (61 sap days); the leanest was 2015 (28).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Whitehall (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for Wisconsin. They describe a typical year at one point in the county; your sugarbush, slope and elevation can shift them by days.

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