Frost dates for Hemlock, NY
At Hemlock, the median last spring frost (32°F) is May 2 and the median first fall frost is Oct 18, for a typical growing season of 167 days. For a 90% chance that the last frost has passed, wait until May 16. Nearby ZIP codes are in USDA hardiness zone 6a.
- May 2Last spring frost (median)50% chance of 32°F after this date
- May 16Safer planting date10% chance of 32°F after this date
- Oct 18First fall frost (median)50% chance of 32°F by this date
- 167 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | Apr 29 | May 12 | May 26 |
| 32°F | Apr 22 | May 2 | May 16 |
| 28°F | Apr 7 | Apr 22 | May 6 |
| 24°F | Mar 30 | Apr 10 | Apr 23 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Sep 23 | Oct 5 | Oct 20 |
| 32°F | Oct 2 | Oct 18 | Nov 3 |
| 28°F | Oct 14 | Nov 1 | Nov 14 |
| 24°F | Oct 29 | Nov 11 | Nov 29 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 127 days | 145 days | 165 days |
| 32°F | 146 days | 167 days | 187 days |
| 28°F | 170 days | 190 days | 210 days |
| 24°F | 197 days | 215 days | 235 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 14466 | 6a | -10 to -5°F | 3 km |
| 14487 | 6a | -10 to -5°F | 5 km |
| 14435 | 6a | -10 to -5°F | 8 km |
| 14560 | 6a | -10 to -5°F | 10 km |
| 14485 | 6a | -10 to -5°F | 12 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00303773, at 42.7742, -77.6083, elevation 275 m (902 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 138.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Honeoye (8 km)
- Avon (20 km)
- Dansville Muni Airport (24 km)
- Mount Morris 2 W (25 km)
- Dansville (25 km)
- Canandaigua 3 S (28 km)
- Victor 2nw (29 km)
- Pavilion 2ne (34 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.