Skip to content
LuckySap
Get the app
Wisconsin · county maple atlas

Maple sugaring in Kewaunee County, Wisconsin

Kewaunee County had 10 maple operations and 581 taps in the 2022 Census. Around Kewaunee, sap usually runs from March 18 to April 7. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 163 days until the usual start.
Sap starts
Mar 18
typical year
Season ends
Apr 7
about 3 weeks
Sap days / season
26.9
1991–2026 average
Taps, 2022
581
#46 of 60 in WI

Sap-flow outlook at Kewaunee right now

Full Wisconsin forecast →

Forecast for Kewaunee, WI

Updated Oct 6, 9:36 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Kewaunee County's season usually opens around March 18, which is 163 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    52° / 69°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    45° / 62°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    43° / 63°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    53° / 67°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    58° / 71°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    55° / 62°
    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 Kewaunee

Freeze-thaw weather at Kewaunee peaks in the weeks of Feb 23 to Apr 6, which hold about 50% of a season's sap days. March is the busiest month.
Typical season: Mar 18 – Apr 70246Week of Dec 1: 1.2 sap days on averageWeek of Dec 8: 1.4 sap days on averageWeek of Dec 15: 1.3 sap days on averageWeek of Dec 22: 1.1 sap days on averageWeek of Dec 29: 0.7 sap days on averageWeek of Jan 5: 0.9 sap days on averageWeek of Jan 12: 0.6 sap days on averageWeek of Jan 19: 0.4 sap days on averageWeek of Jan 26: 0.6 sap days on averageWeek of Feb 2: 0.8 sap days on averageWeek of Feb 9: 1.0 sap days on averageWeek of Feb 16: 1.2 sap days on averageWeek of Feb 23: 1.5 sap days on averageWeek of Mar 2: 1.6 sap days on averageWeek of Mar 9: 1.8 sap days on averageWeek of Mar 16: 2.0 sap days on averageWeek of Mar 23: 2.5 sap days on averageWeek of Mar 30: 2.3 sap days on averageWeek of Apr 6: 1.8 sap days on averageWeek of Apr 13: 0.9 sap days on averageWeek of Apr 20: 0.9 sap days on averageWeek of Apr 27: 0.3 sap days on averageWeek of May 4: 0.1 sap days on averageWeek of May 11: 0.1 sap days on averageWeek of May 18: 0.1 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Mar 18
Average number of freeze-thaw sap days in each week of the season at Kewaunee, 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 15; the middle half of seasons fell between Mar 6 and Mar 21. Earliest Feb 15 (2012), latest Apr 14 (2008).
Closing signal
Median Apr 10; middle half between Apr 3 and Apr 18. Earliest Mar 11 (2012), latest Apr 29 (2018).
Sap days by month
Dec20%Jan10%Feb16%Mar33%Apr20%May1%

36 seasons of sap weather

Kewaunee County seasons, 1991–2026

The best sap year at Kewaunee was 2002 with 42 freeze-thaw days; the leanest was 1998 with 15. 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: Mar 8 – Apr 11, 29 sap days2920252025: Mar 14 – Apr 9, 33 sap days3320242024: Mar 2 – Mar 31, 30 sap days3020232023: Mar 10 – Apr 9, 37 sap days3720222022: Mar 25 – Apr 28, 23 sap days2320212021: Mar 6 – Apr 3, 36 sap days3620202020: Mar 21 – Apr 23, 35 sap days3520192019: Mar 19 – Apr 12, 26 sap days2620182018: Mar 27 – Apr 29, 38 sap days3820172017: Mar 4 – Apr 1, 21 sap days2120162016: Mar 21 – Apr 13, 22 sap days2220152015: Mar 13 – Apr 4, 22 sap days2220142014: Mar 29 – Apr 23, 16 sap days1620132013: Mar 27 – Apr 21, 29 sap days2920122012: Feb 15 – Mar 11, 41 sap days4120112011: Mar 23 – Apr 7, 16 sap days1620102010: Mar 6 – Mar 30, 19 sap days1920092009: Mar 20 – Apr 23, 24 sap days2420082008: Apr 14 – Apr 16, 19 sap days1920072007: Feb 26 – Mar 21, 24 sap days2420062006: Mar 10 – Apr 9, 24 sap days2420052005: Mar 13 – Apr 5, 21 sap days2120042004: Mar 15 – Apr 15, 35 sap days3520032003: Mar 16 – Apr 13, 28 sap days2820022002: Mar 13 – Apr 7, 42 sap days4220012001: Mar 17 – Apr 18, 24 sap days2420002000: Feb 19 – Mar 14, 30 sap days3019991999: Mar 2 – Mar 27, 31 sap days3119981998: Feb 27 – Mar 25, 15 sap days1519971997: Mar 20 – Apr 18, 22 sap days2219961996: Mar 26 – Apr 28, 29 sap days2919951995: Mar 14 – Apr 10, 28 sap days2819941994: Mar 15 – Apr 8, 26 sap days2619931993: Mar 23 – Apr 27, 25 sap days2519921992: Mar 21 – Apr 12, 27 sap days2719911991: Mar 3 – Apr 2, 21 sap days21
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Kewaunee. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Kewaunee County in the Census of Agriculture

USDA counts maple operations every five years. In Kewaunee County the 2022 Census found 10 farms making syrup (+67% since 2017), with taps -68% and syrup output -60% over the same five years. That works out to about 0.18 gallons of syrup per tap in 2022 (0.14 in 2017). Among the 385 counties in this atlas, Kewaunee County ranks 308 by taps.

Kewaunee County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
2022105811030.18
201761,8402550.14

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 Kewaunee (607ft), 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

Kewaunee County sugaring questions

When should I tap maple trees in Kewaunee County, Wisconsin?
In a typical year the sap starts running around March 18 near Kewaunee and the season winds down around April 7. 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 15 and as late as Apr 14.
How much maple syrup does Kewaunee County produce?
The 2022 Census of Agriculture counted 10 maple operations in Kewaunee County with 581 taps producing 103 gallons of syrup, ranking 46 of 60 Wisconsin's counties with published tap counts.
How many sap days does Kewaunee County get in a season?
On average 26.9 freeze-thaw sap days from December through May at Kewaunee, of which about 11.5 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2002 (42 sap days); the leanest was 1998 (15).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Kewaunee (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.

LuckySap · free on iPhone & Android

Get a heads-up when the sap will run in Kewaunee County

LuckySap watches the forecast for your trees and can ping you the night before a strong sap day, then keeps every collection and boil in one season log. Free on iPhone and Android.

Download on the App StoreGet it on Google Play