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Vermont · county maple atlas

Maple sugaring in Windsor County, Vermont

Windsor County had 108 maple operations and 243,850 taps in the 2022 Census. Around Woodstock, sap usually runs from March 3 to April 14. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 148 days until the usual start.
Sap starts
Mar 3
typical year
Season ends
Apr 14
about 6 weeks
Sap days / season
50
1991–2026 average
Taps, 2022
243,850
#11 of 12 in VT

Sap-flow outlook at Woodstock right now

Full Vermont forecast →

Forecast for Woodstock, VT

Updated Oct 6, 2:25 AM EDT

Only marginal days ahead

freeze thaw 32°F

  1. WedOct 7
    31° / 67°

    2h below · 20h above

    Maybe a light run
  2. ThuOct 8
    46° / 69°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    42° / 59°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    40° / 61°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    40° / 68°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    48° / 68°
    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 Woodstock

Freeze-thaw weather at Woodstock peaks in the weeks of Mar 2 to Apr 13, which hold about 48% of a season's sap days. March is the busiest month.
Typical season: Mar 3 – Apr 140246Week of Dec 1: 2.2 sap days on averageWeek of Dec 8: 2.3 sap days on averageWeek of Dec 15: 1.6 sap days on averageWeek of Dec 22: 1.4 sap days on averageWeek of Dec 29: 1.3 sap days on averageWeek of Jan 5: 1.1 sap days on averageWeek of Jan 12: 1.2 sap days on averageWeek of Jan 19: 1.0 sap days on averageWeek of Jan 26: 1.0 sap days on averageWeek of Feb 2: 1.7 sap days on averageWeek of Feb 9: 1.5 sap days on averageWeek of Feb 16: 2.3 sap days on averageWeek of Feb 23: 2.3 sap days on averageWeek of Mar 2: 2.6 sap days on averageWeek of Mar 9: 3.2 sap days on averageWeek of Mar 16: 3.7 sap days on averageWeek of Mar 23: 4.1 sap days on averageWeek of Mar 30: 4.0 sap days on averageWeek of Apr 6: 3.7 sap days on averageWeek of Apr 13: 2.8 sap days on averageWeek of Apr 20: 2.2 sap days on averageWeek of Apr 27: 1.4 sap days on averageWeek of May 4: 0.7 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: 0.1 sap days on averageDecJanFebMarAprMaytaps in ~Mar 3
Average number of freeze-thaw sap days in each week of the season at Woodstock, 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 7 and Mar 17. Earliest Feb 17 (2012), latest Mar 24 (2015).
Closing signal
Median Apr 17; middle half between Apr 10 and Apr 19. Earliest Mar 16 (2012), latest Apr 26 (1997).
Sap days by month
Dec16%Jan10%Feb15%Mar31%Apr25%May3%

36 seasons of sap weather

Windsor County seasons, 1991–2026

The best sap year at Woodstock was 1999 with 69 freeze-thaw days; the leanest was 2021 with 29. 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, 38 sap days3820252025: Mar 14 – Apr 18, 34 sap days3420242024: Mar 6 – Apr 9, 51 sap days5120232023: Mar 11 – Apr 10, 57 sap days5720222022: Mar 8 – Apr 11, 49 sap days4920212021: Mar 5 – Apr 5, 29 sap days2920202020: Mar 5 – Apr 8, 64 sap days6420192019: Mar 17 – Apr 18, 43 sap days4320182018: Mar 22 – Apr 24, 52 sap days5220172017: Mar 8 – Apr 10, 45 sap days4520162016: Feb 26 – Apr 1, 64 sap days6420152015: Mar 24 – Apr 25, 32 sap days3220142014: Mar 19 – Apr 21, 41 sap days4120132013: Mar 15 – Apr 18, 55 sap days5520122012: Feb 17 – Mar 16, 64 sap days6420112011: Mar 19 – Apr 22, 32 sap days3220102010: Feb 27 – Mar 29, 49 sap days4920092009: Mar 13 – Apr 17, 50 sap days5020082008: Mar 17 – Apr 18, 50 sap days5020072007: Mar 19 – Apr 22, 56 sap days5620062006: Mar 7 – Apr 11, 53 sap days5320052005: Mar 12 – Apr 16, 52 sap days5220042004: Mar 15 – Apr 18, 47 sap days4720032003: Mar 17 – Apr 19, 38 sap days3820022002: Mar 10 – Apr 12, 66 sap days6620012001: Mar 21 – Apr 21, 45 sap days4520002000: Mar 3 – Apr 7, 55 sap days5519991999: Mar 13 – Apr 16, 69 sap days6919981998: Mar 4 – Apr 8, 56 sap days5619971997: Mar 22 – Apr 26, 53 sap days5319961996: Mar 18 – Apr 20, 45 sap days4519951995: Mar 14 – Apr 18, 58 sap days5819941994: Mar 16 – Apr 19, 51 sap days5119931993: Mar 14 – Apr 15, 44 sap days4419921992: Mar 22 – Apr 17, 53 sap days5319911991: Mar 4 – Apr 5, 59 sap days59
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Woodstock. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Windsor County in the Census of Agriculture

USDA counts maple operations every five years. In Windsor County the 2022 Census found 108 farms making syrup (-21% since 2017), with taps -2% and syrup output -3% over the same five years. That works out to about 0.30 gallons of syrup per tap in 2022 (0.31 in 2017). Among the 385 counties in this atlas, Windsor County ranks 16 by taps.

Windsor County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
2022108243,85073,2790.30
2017137247,70775,6980.31

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 Woodstock (971ft), 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 Vermont'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 — Vermont, 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

Windsor County sugaring questions

When should I tap maple trees in Windsor County, Vermont?
In a typical year the sap starts running around March 3 near Woodstock and the season winds down around April 14. 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 17 and as late as Mar 24.
How much maple syrup does Windsor County produce?
The 2022 Census of Agriculture counted 108 maple operations in Windsor County with 243,850 taps producing 73,279 gallons of syrup, ranking 11 of 12 Vermont's counties with published tap counts.
How many sap days does Windsor County get in a season?
On average 50 freeze-thaw sap days from December through May at Woodstock, of which about 13.3 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 1999 (69 sap days); the leanest was 2021 (29).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Woodstock (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for Vermont. 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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