Frost dates for Newport, WA
At Newport, the median last spring frost (32°F) is May 12 and the median first fall frost is Sep 21, for a typical growing season of 130 days. For a 90% chance that the last frost has passed, wait until May 29. Nearby ZIP codes are in USDA hardiness zones 6a to 6b.
- May 12Last spring frost (median)50% chance of 32°F after this date
- May 29Safer planting date10% chance of 32°F after this date
- Sep 21First fall frost (median)50% chance of 32°F by this date
- 130 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 | May 14 | Jun 1 | Jun 26 |
| 32°F | Apr 28 | May 12 | May 29 |
| 28°F | Apr 13 | Apr 30 | May 14 |
| 24°F | Mar 19 | Apr 10 | May 2 |
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 | Aug 24 | Sep 6 | Sep 21 |
| 32°F | Sep 5 | Sep 21 | Oct 5 |
| 28°F | Sep 18 | Oct 2 | Oct 26 |
| 24°F | Sep 30 | Oct 22 | Nov 14 |
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 | 68 days | 95 days | 118 days |
| 32°F | 107 days | 130 days | 151 days |
| 28°F | 135 days | 157 days | 185 days |
| 24°F | 164 days | 195 days | 227 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 |
|---|---|---|---|
| 83822 | 6a | -10 to -5°F | 4 km |
| 99156 | 6a | -10 to -5°F | 11 km |
| 83804 | 6b | -5 to 0°F | 16 km |
| 99180 | 6a | -10 to -5°F | 23 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 USC00455844, at 48.1842, -117.0475, elevation 659 m (2,162 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 168.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Deer Park Airport (37 km)
- Chewelah (52 km)
- Spokane Felts Field (59 km)
- Spokane WFO (71 km)
- Spokane Intl Airport (72 km)
- Colville (78 km)
- Spokane 17 SSW (92 km)
- Boundary Dam (93 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.