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New Hampshire · county maple atlas

Maple sugaring in Coos County, New Hampshire

Coos County had 46 maple operations and 92,173 taps in the 2022 Census, number 2 in New Hampshire. Around Lancaster, sap usually runs from March 11 to April 18. Here's the long-run pattern, 36 seasons of sap weather, and the outlook this week.
Too early to tapAbout 156 days until the usual start.
Sap starts
Mar 11
typical year
Season ends
Apr 18
about 5 weeks
Sap days / season
46.9
1991–2026 average
Taps, 2022
92,173
#2 of 10 in NH

Sap-flow outlook at Lancaster right now

Full New Hampshire forecast →

Forecast for Lancaster, NH

Updated Oct 6, 6:54 AM EDT

1 sap day in the next 6

freeze thaw 32°F

  1. WedOct 7
    26° / 61°

    9h below · 15h above

    Sap likely
  2. ThuOct 8
    44° / 63°

    0h below · 24h above

    Run tapering
  3. FriOct 9
    37° / 56°

    0h below · 24h above

    No refreeze forecast
  4. SatOct 10
    34° / 56°

    0h below · 24h above

    No refreeze forecast
  5. SunOct 11
    35° / 67°

    0h below · 24h above

    No refreeze forecast
  6. MonOct 12
    45° / 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 Lancaster

Freeze-thaw weather at Lancaster peaks in the weeks of Mar 9 to Apr 20, which hold about 52% of a season's sap days. April is the busiest month.
Typical season: Mar 11 – Apr 180246Week of Dec 1: 1.6 sap days on averageWeek of Dec 8: 1.6 sap days on averageWeek of Dec 15: 1.3 sap days on averageWeek of Dec 22: 0.9 sap days on averageWeek of Dec 29: 0.9 sap days on averageWeek of Jan 5: 0.7 sap days on averageWeek of Jan 12: 0.8 sap days on averageWeek of Jan 19: 0.7 sap days on averageWeek of Jan 26: 0.5 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: 1.9 sap days on averageWeek of Feb 23: 1.8 sap days on averageWeek of Mar 2: 2.3 sap days on averageWeek of Mar 9: 2.8 sap days on averageWeek of Mar 16: 2.9 sap days on averageWeek of Mar 23: 4.0 sap days on averageWeek of Mar 30: 4.1 sap days on averageWeek of Apr 6: 3.9 sap days on averageWeek of Apr 13: 3.6 sap days on averageWeek of Apr 20: 3.0 sap days on averageWeek of Apr 27: 2.4 sap days on averageWeek of May 4: 1.6 sap days on averageWeek of May 11: 1.0 sap days on averageWeek of May 18: 0.4 sap days on averageWeek of May 25: 0.2 sap days on averageDecJanFebMarAprMaytaps in ~Mar 11
Average number of freeze-thaw sap days in each week of the season at Lancaster, 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 19; the middle half of seasons fell between Mar 13 and Mar 23. Earliest Mar 1 (2010), latest Mar 28 (1992).
Closing signal
Median Apr 20; middle half between Apr 13 and Apr 24. Earliest Mar 29 (2010), latest May 2 (1992).
Sap days by month
Dec12%Jan7%Feb12%Mar29%Apr32%May8%

36 seasons of sap weather

Coos County seasons, 1991–2026

The best sap year at Lancaster was 1999 with 67 freeze-thaw days; the leanest was 2015 with 28. 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 12 – Apr 12, 42 sap days4220252025: Mar 17 – Apr 21, 41 sap days4120242024: Mar 10 – Apr 10, 51 sap days5120232023: Mar 13 – Apr 11, 60 sap days6020222022: Mar 11 – Apr 13, 50 sap days5020212021: Mar 7 – Apr 5, 39 sap days3920202020: Mar 22 – Apr 25, 57 sap days5720192019: Mar 20 – Apr 19, 41 sap days4120182018: Mar 27 – Apr 24, 46 sap days4620172017: Mar 14 – Apr 16, 41 sap days4120162016: Mar 15 – Apr 18, 58 sap days5820152015: Mar 28 – Apr 24, 28 sap days2820142014: Mar 24 – Apr 25, 41 sap days4120132013: Mar 23 – Apr 27, 48 sap days4820122012: Mar 3 – Apr 7, 51 sap days5120112011: Mar 23 – Apr 23, 33 sap days3320102010: Mar 1 – Mar 29, 40 sap days4020092009: Mar 20 – Apr 24, 53 sap days5320082008: Mar 19 – Apr 18, 40 sap days4020072007: Mar 24 – Apr 26, 49 sap days4920062006: Mar 12 – Apr 12, 49 sap days4920052005: Mar 18 – Apr 22, 47 sap days4720042004: Mar 20 – Apr 22, 48 sap days4820032003: Mar 21 – Apr 19, 33 sap days3320022002: Mar 14 – Apr 12, 53 sap days5320012001: Mar 28 – May 1, 43 sap days4320002000: Mar 15 – Apr 19, 54 sap days5419991999: Mar 20 – Apr 24, 67 sap days6719981998: Mar 9 – Apr 13, 41 sap days4119971997: Mar 27 – Apr 30, 52 sap days5219961996: Mar 20 – Apr 20, 41 sap days4119951995: Mar 17 – Apr 21, 54 sap days5419941994: Mar 25 – Apr 24, 50 sap days5019931993: Mar 16 – Apr 20, 35 sap days3519921992: Mar 28 – May 2, 52 sap days5219911991: Mar 12 – Apr 15, 60 sap days60
Each bar runs from the season's opening signal to its closing signal, estimated from daily temperatures at Lancaster. Dashed lines mark the typical dates. The right column counts freeze-thaw sap days from December through May.

Maple production

Coos County in the Census of Agriculture

USDA counts maple operations every five years. In Coos County the 2022 Census found 46 farms making syrup (+77% since 2017), with taps +12% and syrup output +48% over the same five years. That works out to about 0.38 gallons of syrup per tap in 2022 (0.29 in 2017). Among the 385 counties in this atlas, Coos County ranks 33 by taps.

Coos County maple production, 2017 and 2022 (USDA Census of Agriculture)
Census yearFarmsTapsGallons of syrupGal / tap
20224692,17335,0730.38
20172682,39023,7310.29

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 Lancaster (899ft), 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 New Hampshire'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 — New Hampshire, 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

Coos County sugaring questions

When should I tap maple trees in Coos County, New Hampshire?
In a typical year the sap starts running around March 11 near Lancaster and the season winds down around April 18. 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 Mar 1 and as late as Mar 28.
How much maple syrup does Coos County produce?
The 2022 Census of Agriculture counted 46 maple operations in Coos County with 92,173 taps producing 35,073 gallons of syrup, ranking 2 of 10 New Hampshire's counties with published tap counts.
How many sap days does Coos County get in a season?
On average 46.9 freeze-thaw sap days from December through May at Lancaster, of which about 10.6 are textbook days with a night in the 20s and a day in the 40s. The best season since 1991 was 1999 (67 sap days); the leanest was 2015 (28).
Where do these dates come from?
From 36 seasons of daily high and low temperatures at Lancaster (PRISM 4-km grid), scored with the same freeze-thaw rule as our live forecast, then calibrated against USDA's reported season dates for New Hampshire. 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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