Your nature year
Green Bay, Wisconsinthrough the year
Also for De Pere, WI: the same nearby places.
When do frost, green-up and fall color come to Green Bay?
Green Bay sits at about 582 feet. Spring green-up reaches town around Apr 20, with first blooms around May 21. Spring takes about 4 weeks to go from leaf to bloom. At the Green Bay Botanical weather station (5.6 mi), the average first fall frost is Oct 9 and the last spring frost May 7, which leaves Green Bay some 155 growing days. For a day trip, Lakewood is 60 miles off; its fall foliage is usually well under way by early October (statewide). Pictured Rocks (146 mi) is the pick for wildflowers, Apr 15–Jun 10 (local timing). Within 150 miles we follow 4 places, out to Pictured Rocks 146 miles to the northeast. Across Wisconsin, fall color is usually well under way by early October.
Updated Sep 28. Sources: US Census Bureau, 2024 Gazetteer (places) ↗ (opens in a new tab), US Census Bureau, city and town population estimates, 2024 ↗ (opens in a new tab), NOAA NCEI U.S. Climate Normals 1991–2020 (annual/seasonal) ↗ (opens in a new tab)
Best this weekend nearby
- Pictured Rocks · 146 mi · Fall foliage
Usually Sep 24–Oct 10
Sat Oct 3: Patchy Frost then Slight Chance Rain Showers, 64°F · Sun Oct 4: Chance Rain Showers, 61°F
No report yet
Places in their own usual window that weekend; reports are the latest official ones, forecasts from the National Weather Service.
Green Bay's year at a glance
- Frost possible
- Frost-free, ~May 7 to ~Oct 9
- First leaf ~Apr 20
- First bloom ~May 21
- Fall color under way ~Oct 8 (WI)
- Today
Near Green Bay right now
- Fall color is usually well under way by early October in WisconsinStatewide · USA-NPN volunteer observations, 2020–2025 · not a forecast~10 days
- First fall frost usually around Oct 9 · last spring frost around May 7NOAA 1991–2020 normals, Green Bay Botanical (5.6 mi, 50% dates)~11 days
- Hiawatha National Forest · 109 mi · Local timing: Sep 21–30Fall foliage · in its window now
- Wildflowers · Pictured Rocks · 146 miLocal timing: Apr 15–Jun 10~7 months
Green Bay's nature year
- Wildflowers · Pictured RocksApr–Jun
- Spring green-upApr
- Last spring frostMay
- Fall color (WI)Oct
- First fall frostOct
Nearby, season by season
Fall foliage
- Lakewood · 60 miStatewide: usually well under way by early October~7 days
- Hiawatha National Forest · 109 miLocal timing: Sep 21–30
- Chequamegon-Nicolet · 125 miStatewide: usually well under way by early October~7 days
Wildflowers
- Pictured Rocks · 146 miLocal timing: Apr 15–Jun 10~7 months
Snow in Green Bay
Snow usually becomes possible around Nov 11 (our calculation from NOAA's daily snow chances: the first day the chance of 0.1" or more of snow reaches 10%). NOAA's normals at Green Bay (6.3 mi away): 56 inches of snow in an average year, about 16.7 days with 1 inch or more.
NOAA's chance of at least 0.1 inch of snow on each date (one value per week, September to May), averaged over 1991–2020. A typical year, not a forecast.
Frost and green-up
Last spring frost
May 7
Average (50% date)
First fall frost
Oct 9
About 155 days without frost between
Spring green-up
Apr 20
First bloom around May 21
Frost: NOAA 1991–2020 climate normals at Green Bay Botanical (5.6 mi from Green Bay), the day a 32 °F night is as likely as not. Green-up: the USA-NPN Spring Index, 1991–2020 average at the town.
Questions people ask
When is the first frost in Green Bay?
On average around Oct 9, and the last spring frost around May 7: about 155 days without frost between. These are NOAA's 1991–2020 normals at Green Bay Botanical, 5.6 miles away (the day a 32 °F night is as likely as not).
When does spring green-up reach Green Bay?
The USA-NPN Spring Index puts first leaf around Apr 20 and first bloom around May 21, on average for 1991–2020 at the town.
Where can I see fall foliage near Green Bay?
Lakewood, 60 miles (statewide: usually well under way by early October); Hiawatha National Forest, 109 miles (local timing: Sep 21–30); Chequamegon-Nicolet, 125 miles (statewide: usually well under way by early October). Distances are straight-line.
Where can I see wildflowers near Green Bay?
Pictured Rocks, 146 miles (local timing: Apr 15–Jun 10). Distances are straight-line.
When does it start snowing in Green Bay?
Snow usually becomes possible around Nov 11: our calculation from NOAA's daily snow chances: the first day the chance of 0.1" or more of snow reaches 10%, at Green Bay. An average year brings 56 inches (NOAA 1991–2020). A typical year, not a forecast.Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (annual/seasonal snowfall) ↗ (opens in a new tab), NOAA NCEI U.S. Climate Normals 1991–2020 (daily snowfall probabilities) ↗ (opens in a new tab)
How we know
US Census Bureau, 2024 Gazetteer (places) (opens in a new tab) (Sep 27) · US Census Bureau, city and town population estimates, 2024 (opens in a new tab) (Sep 27) · NOAA NCEI U.S. Climate Normals 1991–2020 (annual/seasonal) (opens in a new tab) (Sep 27) · USA National Phenology Network, Spring Index 1991–2020 averages (opens in a new tab) (Sep 27) · USA National Phenology Network, colored leaves observations (opens in a new tab) (Sep 28)