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Wisconsin · county maple atlas

Maple sugaring in Burnett County, Wisconsin

Burnett County had 5 maple operations and 540 taps in the 2022 Census. Around Siren, sap usually runs from March 17 to April 13. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 162 days until the usual start.
Sap starts
Mar 17
typical year
Season ends
Apr 13
about 4 weeks
Sap days / season
37.1
1991–2026 average
Taps, 2022
540
#47 of 60 in WI

Sap-flow outlook at Siren right now

Full Wisconsin forecast →

Forecast for Siren, WI

Updated Oct 6, 10:51 AM EDT

Off-season for now. Sap needs freezing nights, and none are in sight. Burnett County's season usually opens around March 17, which is 162 days away.

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    43° / 71°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    38° / 65°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    38° / 67°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    51° / 77°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    58° / 72°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    48° / 58°
    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 Siren

Freeze-thaw weather at Siren peaks in the weeks of Mar 9 to Apr 20, which hold about 58% of a season's sap days. March is the busiest month.
Typical season: Mar 17 – Apr 130246Week of Dec 1: 1.1 sap days on averageWeek of Dec 8: 1.2 sap days on averageWeek of Dec 15: 0.8 sap days on averageWeek of Dec 22: 0.8 sap days on averageWeek of Dec 29: 0.4 sap days on averageWeek of Jan 5: 0.5 sap days on averageWeek of Jan 12: 0.4 sap days on averageWeek of Jan 19: 0.2 sap days on averageWeek of Jan 26: 0.7 sap days on averageWeek of Feb 2: 1.0 sap days on averageWeek of Feb 9: 0.9 sap days on averageWeek of Feb 16: 1.6 sap days on averageWeek of Feb 23: 1.4 sap days on averageWeek of Mar 2: 2.1 sap days on averageWeek of Mar 9: 2.6 sap days on averageWeek of Mar 16: 3.4 sap days on averageWeek of Mar 23: 3.7 sap days on averageWeek of Mar 30: 3.4 sap days on averageWeek of Apr 6: 3.4 sap days on averageWeek of Apr 13: 2.5 sap days on averageWeek of Apr 20: 2.5 sap days on averageWeek of Apr 27: 1.5 sap days on averageWeek of May 4: 0.5 sap days on averageWeek of May 11: 0.4 sap days on averageWeek of May 18: 0.2 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Mar 17
Average number of freeze-thaw sap days in each week of the season at Siren, 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 14; the middle half of seasons fell between Mar 8 and Mar 21. Earliest Feb 15 (2012), latest Apr 3 (2013).
Closing signal
Median Apr 16; middle half between Apr 10 and Apr 24. Earliest Mar 11 (2012), latest May 3 (1996).
Sap days by month
Dec11%Jan5%Feb13%Mar35%Apr32%May4%

36 seasons of sap weather

Burnett County seasons, 1991–2026

The best sap year at Siren was 2002 with 57 freeze-thaw days; the leanest was 2014 with 23. 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 10 – Apr 12, 44 sap days4420252025: Mar 13 – Apr 17, 45 sap days4520242024: Mar 8 – Apr 8, 52 sap days5220232023: Mar 26 – Apr 27, 34 sap days3420222022: Mar 29 – Apr 28, 37 sap days3720212021: Mar 3 – Apr 4, 49 sap days4920202020: Mar 23 – Apr 25, 46 sap days4620192019: Mar 21 – Apr 23, 41 sap days4120182018: Mar 29 – Apr 29, 41 sap days4120172017: Mar 3 – Apr 7, 40 sap days4020162016: Mar 12 – Apr 14, 40 sap days4020152015: Mar 8 – Apr 12, 31 sap days3120142014: Mar 31 – Apr 26, 23 sap days2320132013: Apr 3 – Apr 25, 24 sap days2420122012: Feb 15 – Mar 11, 31 sap days3120112011: Mar 20 – Apr 24, 34 sap days3420102010: Feb 27 – Mar 29, 34 sap days3420092009: Mar 12 – Apr 16, 33 sap days3320082008: Mar 22 – Apr 18, 30 sap days3020072007: Mar 13 – Apr 16, 30 sap days3020062006: Mar 11 – Apr 10, 29 sap days2920052005: Mar 6 – Apr 8, 33 sap days3320042004: Mar 14 – Apr 15, 47 sap days4720032003: Mar 9 – Apr 11, 29 sap days2920022002: Mar 15 – Apr 10, 57 sap days5720012001: Mar 21 – Apr 19, 26 sap days2620002000: Feb 22 – Mar 29, 43 sap days4319991999: Mar 10 – Apr 13, 46 sap days4619981998: Mar 3 – Apr 5, 29 sap days2919971997: Mar 21 – Apr 24, 26 sap days2619961996: Mar 29 – May 3, 42 sap days4219951995: Mar 18 – Apr 20, 43 sap days4319941994: Mar 14 – Apr 12, 42 sap days4219931993: Mar 20 – Apr 22, 33 sap days3319921992: Mar 24 – Apr 28, 33 sap days3319911991: Mar 3 – Apr 2, 40 sap days40
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Siren. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Burnett County in the Census of Agriculture

USDA counts maple operations every five years. In Burnett County the 2022 Census found 5 farms making syrup (-75% since 2017), with taps -82% and syrup output -80% over the same five years. That works out to about 0.27 gallons of syrup per tap in 2022 (0.25 in 2017). Among the 385 counties in this atlas, Burnett County ranks 311 by taps.

Burnett County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
202255401450.27
2017202,9757350.25

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 Siren (994ft), 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

Burnett County sugaring questions

When should I tap maple trees in Burnett County, Wisconsin?
In a typical year the sap starts running around March 17 near Siren and the season winds down around April 13. 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 3.
How much maple syrup does Burnett County produce?
The 2022 Census of Agriculture counted 5 maple operations in Burnett County with 540 taps producing 145 gallons of syrup, ranking 47 of 60 Wisconsin's counties with published tap counts.
How many sap days does Burnett County get in a season?
On average 37.1 freeze-thaw sap days from December through May at Siren, of which about 9.3 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 2002 (57 sap days); the leanest was 2014 (23).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Siren (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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