Frost dates for Ottawa, OH
When the last spring frost and first fall frost usually come, and when to plant, from 30 years of NOAA weather records.
Last spring frost
April 23
typical year
Safe to plant
May 9
frost is over in 9 of 10 years
First fall frost
October 22
typical year
Growing season
180 days
frost-free, typical year
Frost watch this week
Tonight's and the next six nights' lows from the National Weather Service forecast for the station's location. Frost: 32°F or colder. Possible frost: 33–36°F, mostly in low spots on clear, still nights.
When to plant
Counted from this page's frost dates. Warm-season crops wait for the safe-to-plant date.
| Crop | Start indoors | Plant outside | Fall planting |
|---|---|---|---|
| Cool-season crops | |||
| Peas | – | Mar 26 – Apr 9 | – |
| Spinach | – | Mar 12 – Apr 2 | Aug 27 – Sep 10 |
| Lettuce | – | Mar 26 – Apr 16 | Aug 27 – Sep 10 |
| Radishes | – | Mar 26 – May 7 | Sep 10 – 24 |
| Onions | – | Mar 26 – Apr 9 | – |
| Potatoes | – | Apr 2 – 16 | – |
| Carrots | – | Apr 2 – 23 | Jul 30 – Aug 13 |
| Beets | – | Mar 26 – Apr 9 | Aug 13 – 27 |
| Kale | Feb 12 – 26 | Mar 26 – Apr 9 | Aug 13 – 27 |
| Broccoli | Feb 12 – 26 | Apr 9 – 23 | Aug 13 – 27 |
| Cabbage | Jan 29 – Feb 12 | Mar 26 – Apr 9 | Aug 13 – 27 |
| Garlic | – | – | Sep 10 – Oct 1 |
| Warm-season crops | |||
| Tomatoes | Mar 14 – 28 | May 9 – 23 | – |
| Peppers | Mar 7 – 21 | May 16 – 30 | – |
| Cucumbers | – | May 9 – 30 | – |
| Zucchini | – | May 9 – Jun 6 | – |
| Pumpkins | – | May 9 – 30 | – |
| Green beans | – | May 9 – Aug 13 | – |
| Sweet corn | – | May 9 – Jun 6 | – |
| Basil | Apr 4 – 18 | May 16 – 23 | – |
Onions: from sets. Green beans: until 10 weeks before the first fall frost. Garlic: harvest next summer.
The year at a glance
Start indoors Plant outside Fall planting
The chance of frost, by date
| 1 year in 10 | Half of years | 9 years in 10 | |
|---|---|---|---|
| Spring frost after | May 9 | April 23 | April 10 |
| Fall frost before | October 6 | October 22 | November 4 |
Frost here means 32°F or colder. Read across: in 1 year in 10, spring frost carries on past the first date, which is why that date is the safe-to-plant date.
Hard freeze (28°F)
A hard freeze kills most garden plants, even hardy ones. The last one in spring usually comes around April 14 (April 29 in a late year), and the first one in fall around November 2.
Towns that use these dates
This is the nearest NOAA station with frost records for 12 towns.
Ottawa, Bluffton, Leipsic, Columbus Grove, Kalida, Pandora, Glandorf, Beaverdam, Mount Cory, West Leipsic, Gilboa, Miller City
Where these dates come from
NOAA weather station PANDORA, OH US (USC00336405), 1991–2020 climate normals. It's the nearest station for 11 zip codes, all within 14 miles:
45808, 45817, 45830, 45848, 45853, 45856, 45864, 45868, 45875, 45877, 45893
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.