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Vermont · county maple atlas

Maple sugaring in Addison County, Vermont

Addison County had 110 maple operations and 728,236 taps in the 2022 Census, number 5 in Vermont. Around Middlebury (village), sap usually runs from February 24 to April 6. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 141 days until the usual start.
Sap starts
Feb 24
typical year
Season ends
Apr 6
about 6 weeks
Sap days / season
41.1
1991–2026 average
Taps, 2022
728,236
#5 of 12 in VT

Sap-flow outlook at Middlebury (village) right now

Full Vermont forecast →

Forecast for Middlebury (village), VT

Updated Oct 6, 2:25 AM EDT

No freeze-thaw days in the forecast

freeze thaw 32°F

  1. WedOct 7
    33° / 64°

    0h below · 24h above

    No refreeze forecast
  2. ThuOct 8
    48° / 66°

    0h below · 24h above

    No refreeze forecast
  3. FriOct 9
    41° / 59°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    39° / 59°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    42° / 66°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    50° / 66°
    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 Middlebury (village)

Freeze-thaw weather at Middlebury (village) 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: Feb 24 – Apr 60246Week of Dec 1: 2.1 sap days on averageWeek of Dec 8: 1.8 sap days on averageWeek of Dec 15: 1.4 sap days on averageWeek of Dec 22: 1.3 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: 1.0 sap days on averageWeek of Jan 19: 0.9 sap days on averageWeek of Jan 26: 1.1 sap days on averageWeek of Feb 2: 1.1 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: 1.9 sap days on averageWeek of Mar 2: 2.4 sap days on averageWeek of Mar 9: 2.7 sap days on averageWeek of Mar 16: 3.0 sap days on averageWeek of Mar 23: 3.2 sap days on averageWeek of Mar 30: 3.4 sap days on averageWeek of Apr 6: 3.0 sap days on averageWeek of Apr 13: 2.1 sap days on averageWeek of Apr 20: 1.4 sap days on averageWeek of Apr 27: 1.1 sap days on averageWeek of May 4: 0.3 sap days on averageWeek of May 11: 0.3 sap days on averageWeek of May 18: 0.0 sap days on averageWeek of May 25: 0.0 sap days on averageDecJanFebMarAprMaytaps in ~Feb 24
Average number of freeze-thaw sap days in each week of the season at Middlebury (village), 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 7; the middle half of seasons fell between Mar 2 and Mar 13. Earliest Feb 14 (2012), latest Mar 20 (1997).
Closing signal
Median Apr 9; middle half between Apr 2 and Apr 16. Earliest Mar 13 (2012), latest Apr 23 (2018).
Sap days by month
Dec17%Jan11%Feb15%Mar31%Apr24%May2%

36 seasons of sap weather

Addison County seasons, 1991–2026

The best sap year at Middlebury (village) was 1999 with 63 freeze-thaw days; the leanest was 2011 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: Mar 6 – Apr 9, 34 sap days3420252025: Feb 24 – Mar 30, 33 sap days3320242024: Feb 25 – Mar 27, 33 sap days3320232023: Mar 8 – Apr 10, 46 sap days4620222022: Mar 6 – Apr 5, 41 sap days4120212021: Mar 3 – Apr 4, 31 sap days3120202020: Mar 4 – Apr 3, 53 sap days5320192019: Mar 13 – Apr 17, 35 sap days3520182018: Mar 19 – Apr 23, 41 sap days4120172017: Mar 5 – Apr 9, 33 sap days3320162016: Feb 24 – Mar 31, 59 sap days5920152015: Mar 17 – Apr 16, 27 sap days2720142014: Mar 11 – Apr 10, 38 sap days3820132013: Mar 12 – Apr 16, 50 sap days5020122012: Feb 14 – Mar 13, 49 sap days4920112011: Mar 12 – Apr 16, 26 sap days2620102010: Feb 25 – Mar 28, 36 sap days3620092009: Mar 5 – Apr 8, 44 sap days4420082008: Mar 13 – Apr 17, 32 sap days3220072007: Mar 14 – Apr 13, 35 sap days3520062006: Feb 25 – Mar 30, 34 sap days3420052005: Mar 12 – Apr 16, 49 sap days4920042004: Mar 14 – Apr 18, 39 sap days3920032003: Mar 16 – Apr 18, 33 sap days3320022002: Mar 6 – Apr 8, 60 sap days6020012001: Mar 20 – Apr 21, 47 sap days4720002000: Feb 23 – Mar 28, 44 sap days4419991999: Mar 3 – Apr 6, 63 sap days6319981998: Feb 25 – Mar 26, 42 sap days4219971997: Mar 20 – Apr 19, 39 sap days3919961996: Mar 15 – Apr 16, 43 sap days4319951995: Feb 20 – Mar 27, 46 sap days4619941994: Mar 12 – Apr 12, 32 sap days3219931993: Mar 12 – Apr 8, 35 sap days3519921992: Mar 18 – Apr 17, 52 sap days5219911991: Mar 3 – Apr 4, 45 sap days45
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Middlebury (village). Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Addison County in the Census of Agriculture

USDA counts maple operations every five years. In Addison County the 2022 Census found 110 farms making syrup (+34% since 2017), with taps +136% and syrup output +122% over the same five years. That works out to about 0.40 gallons of syrup per tap in 2022 (0.43 in 2017). Among the 385 counties in this atlas, Addison County ranks 6 by taps.

Addison County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
2022110728,236293,1480.40
201782308,392131,8990.43

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 Middlebury (village) (377ft), 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

Addison County sugaring questions

When should I tap maple trees in Addison County, Vermont?
In a typical year the sap starts running around February 24 near Middlebury (village) 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 14 and as late as Mar 20.
How much maple syrup does Addison County produce?
The 2022 Census of Agriculture counted 110 maple operations in Addison County with 728,236 taps producing 293,148 gallons of syrup, ranking 5 of 12 Vermont's counties with published tap counts.
How many sap days does Addison County get in a season?
On average 41.1 freeze-thaw sap days from December through May at Middlebury (village), of which about 11.9 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 1999 (63 sap days); the leanest was 2011 (26).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Middlebury (village) (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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