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Wisconsin · county maple atlas

Maple sugaring in Clark County, Wisconsin

Clark County had 122 maple operations and 75,971 taps in the 2022 Census. Around Neillsville, sap usually runs from March 14 to April 9. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 159 days until the usual start.
Sap starts
Mar 14
typical year
Season ends
Apr 9
about 4 weeks
Sap days / season
39.7
1991–2026 average
Taps, 2022
75,971
#6 of 60 in WI

Sap-flow outlook at Neillsville right now

Full Wisconsin forecast →

Forecast for Neillsville, WI

Updated Oct 6, 9:06 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Clark County's season usually opens around March 14, which is 159 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    48° / 71°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    42° / 65°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    39° / 68°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    49° / 77°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    58° / 77°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    52° / 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 Neillsville

Freeze-thaw weather at Neillsville peaks in the weeks of Mar 2 to Apr 6, which hold about 50% of a season's sap days. March is the busiest month.
Typical season: Mar 14 – Apr 90246Week of Dec 1: 1.1 sap days on averageWeek of Dec 8: 1.6 sap days on averageWeek of Dec 15: 1.0 sap days on averageWeek of Dec 22: 1.0 sap days on averageWeek of Dec 29: 0.5 sap days on averageWeek of Jan 5: 0.8 sap days on averageWeek of Jan 12: 0.6 sap days on averageWeek of Jan 19: 0.3 sap days on averageWeek of Jan 26: 0.7 sap days on averageWeek of Feb 2: 1.2 sap days on averageWeek of Feb 9: 1.2 sap days on averageWeek of Feb 16: 1.7 sap days on averageWeek of Feb 23: 1.8 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: 3.7 sap days on averageWeek of Mar 23: 3.9 sap days on averageWeek of Mar 30: 3.7 sap days on averageWeek of Apr 6: 3.3 sap days on averageWeek of Apr 13: 2.1 sap days on averageWeek of Apr 20: 1.9 sap days on averageWeek of Apr 27: 1.3 sap days on averageWeek of May 4: 0.6 sap days on averageWeek of May 11: 0.5 sap days on averageWeek of May 18: 0.1 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Mar 14
Average number of freeze-thaw sap days in each week of the season at Neillsville, 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 11; the middle half of seasons fell between Mar 1 and Mar 17. Earliest Feb 10 (2024), latest Mar 30 (2013).
Closing signal
Median Apr 12; middle half between Apr 3 and Apr 18. Earliest Mar 11 (2012), latest Apr 30 (2018).
Sap days by month
Dec12%Jan6%Feb14%Mar37%Apr27%May4%

36 seasons of sap weather

Clark County seasons, 1991–2026

The best sap year at Neillsville was 2024 with 58 freeze-thaw days; the leanest was 2001 with 26. 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 28 – Apr 1, 42 sap days4220252025: Mar 8 – Apr 12, 43 sap days4320242024: Feb 10 – Mar 17, 58 sap days5820232023: Mar 10 – Apr 8, 44 sap days4420222022: Mar 20 – Apr 20, 36 sap days3620212021: Feb 28 – Apr 3, 48 sap days4820202020: Mar 16 – Apr 19, 51 sap days5120192019: Mar 16 – Apr 16, 36 sap days3620182018: Mar 27 – Apr 30, 54 sap days5420172017: Mar 1 – Apr 2, 34 sap days3420162016: Feb 28 – Apr 4, 39 sap days3920152015: Mar 7 – Apr 11, 30 sap days3020142014: Mar 21 – Apr 19, 27 sap days2720132013: Mar 30 – Apr 25, 33 sap days3320122012: Feb 14 – Mar 11, 40 sap days4020112011: Mar 19 – Apr 22, 32 sap days3220102010: Feb 27 – Mar 30, 34 sap days3420092009: Mar 14 – Apr 16, 41 sap days4120082008: Mar 19 – Apr 16, 34 sap days3420072007: Feb 27 – Mar 24, 39 sap days3920062006: Mar 9 – Apr 10, 34 sap days3420052005: Mar 5 – Apr 4, 39 sap days3920042004: Mar 12 – Apr 15, 49 sap days4920032003: Mar 10 – Apr 13, 38 sap days3820022002: Mar 12 – Apr 7, 56 sap days5620012001: Mar 17 – Apr 19, 26 sap days2620002000: Feb 21 – Mar 22, 44 sap days4419991999: Mar 2 – Mar 28, 39 sap days3919981998: Mar 1 – Apr 5, 28 sap days2819971997: Mar 16 – Apr 18, 35 sap days3519961996: Mar 21 – Apr 25, 45 sap days4519951995: Mar 11 – Apr 14, 41 sap days4119941994: Mar 14 – Apr 11, 42 sap days4219931993: Mar 22 – Apr 26, 37 sap days3719921992: Mar 18 – Apr 15, 39 sap days3919911991: Mar 3 – Apr 1, 43 sap days43
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Neillsville. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Clark County in the Census of Agriculture

USDA counts maple operations every five years. In Clark County the 2022 Census found 122 farms making syrup (-35% since 2017), with taps -22% and syrup output +7% over the same five years. That works out to about 0.27 gallons of syrup per tap in 2022 (0.20 in 2017). Among the 385 counties in this atlas, Clark County ranks 41 by taps.

Clark County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
202212275,97120,1110.27
201718797,02718,8810.20

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 Neillsville (1,073ft), 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

Clark County sugaring questions

When should I tap maple trees in Clark County, Wisconsin?
In a typical year the sap starts running around March 14 near Neillsville and the season winds down around April 9. 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 10 and as late as Mar 30.
How much maple syrup does Clark County produce?
The 2022 Census of Agriculture counted 122 maple operations in Clark County with 75,971 taps producing 20,111 gallons of syrup, ranking 6 of 60 Wisconsin's counties with published tap counts.
How many sap days does Clark County get in a season?
On average 39.7 freeze-thaw sap days from December through May at Neillsville, 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 2024 (58 sap days); the leanest was 2001 (26).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Neillsville (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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