Tidewater, OR frost dates
Last spring frostApr 13median date
First fall frostNov 3median date
Growing season204 daysfrost-free
Hardiness zone9aZone 9a
How Tidewater compares
- In 8 years out of 10, the last spring frost in Tidewater falls between March 17 and May 3, a 47-day window. The first fall frost falls between October 9 and December 3.
- The median last frost is 3 days earlier than the Oregon median of Apr 16.
- Its 204-day growing season is longer than 60% of the 345 Oregon places with a regular frost season (state median 193 days).
- The last frost is 41 days later than the zone 9a median of Mar 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 9a chart.
- The weather station records an average of 53 nights a year at or below 32°F.
- Compared with Corvallis, OR, 54 km away, the last frost here is 4 days earlier than there and the growing season is 10 days longer.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 17 |
| 50% (median) | April 13 |
| 10% (safe for tender plants) | May 3 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 9 |
| 50% (median) | November 3 |
| 90% (late) | December 3 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Tidewater, OR
Tidewater, OR frost dates — last frost Apr 13, first frost Nov 3, zone 9a. whenisthelastfrost.com
Crop
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Start indoors: Jan 19 to Feb 2Transplant outside: Mar 16 to Mar 30
Start indoors: Feb 2 to Feb 16Transplant outside: Apr 27 to May 11
Start indoors: Feb 2 to Feb 16Transplant outside: Apr 27 to May 11
Start indoors: Feb 16 to Mar 2Transplant outside: Apr 20 to May 4
Start indoors: Feb 16 to Mar 2Transplant outside: Mar 23 to Apr 6Sow outdoors: Mar 16 to Apr 20Plant for fall: Sep 8 to Oct 6
Start indoors: Feb 16 to Mar 2Transplant outside: Mar 16 to Mar 30Sow outdoors: Mar 16 to Mar 30Plant for fall: Aug 25 to Sep 15
Start indoors: Feb 16 to Mar 2Transplant outside: Mar 30 to Apr 13Plant for fall: Jul 28 to Aug 18
Start indoors: Feb 16 to Mar 2Transplant outside: Mar 23 to Apr 6Plant for fall: Jul 28 to Aug 18
Start indoors: Feb 16 to Mar 2Transplant outside: Mar 30 to Apr 13Plant for fall: Jul 28 to Aug 18
Start indoors: Mar 2 to Mar 16Transplant outside: May 4 to May 18Sow outdoors: May 4 to May 18
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 20 to May 4
Sow outdoors: Mar 2 to Mar 23Plant for fall: Aug 11 to Sep 1
Sow outdoors: Mar 2 to Mar 23Plant for fall: Sep 8 to Sep 29
Sow outdoors: Mar 9 to Apr 20Plant for fall: Sep 22 to Oct 13
Start indoors: Mar 16 to Mar 23Transplant outside: Apr 27 to May 4Sow outdoors: Apr 20 to May 4Plant for fall: Aug 18 to Sep 1
Start indoors: Mar 16 to Mar 23Sow outdoors: Apr 20 to May 4Plant for fall: Aug 25 to Sep 8
Start indoors: Mar 16 to Mar 23Sow outdoors: Apr 20 to May 4
Start indoors: Mar 16 to Mar 23Transplant outside: Apr 27 to May 11
Sow outdoors: Mar 23 to Apr 20Plant for fall: Aug 11 to Aug 25
Sow outdoors: Mar 23 to Apr 20Plant for fall: Aug 25 to Sep 8
Sow outdoors: Mar 23 to Apr 13
Sow outdoors: Mar 30 to Apr 27Plant for fall: Aug 25 to Sep 8
Sow outdoors: Mar 30 to Apr 20Plant for fall: Sep 8 to Sep 29
Sow outdoors: Apr 20 to May 11Plant for fall: Aug 18 to Sep 1
Sow outdoors: Apr 20 to May 4
Transplant outside: Apr 27 to May 18
Plant for fall: Oct 20 to Nov 24
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Tidewater, OR
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 19 – Feb 2 | Mar 16 – Mar 30 | — | — |
| Peppers | Feb 2 – Feb 16 | Apr 27 – May 11 | — | — |
| Eggplant | Feb 2 – Feb 16 | Apr 27 – May 11 | — | — |
| Tomatoes | Feb 16 – Mar 2 | Apr 20 – May 4 | — | — |
| Lettuce | Feb 16 – Mar 2 | Mar 23 – Apr 6 | Mar 16 – Apr 20 | Sep 8 – Oct 6 |
| Kale | Feb 16 – Mar 2 | Mar 16 – Mar 30 | Mar 16 – Mar 30 | Aug 25 – Sep 15 |
| Broccoli | Feb 16 – Mar 2 | Mar 30 – Apr 13 | — | Jul 28 – Aug 18 |
| Cabbage | Feb 16 – Mar 2 | Mar 23 – Apr 6 | — | Jul 28 – Aug 18 |
| Cauliflower | Feb 16 – Mar 2 | Mar 30 – Apr 13 | — | Jul 28 – Aug 18 |
| Okra | Mar 2 – Mar 16 | May 4 – May 18 | May 4 – May 18 | — |
| Basil | Mar 2 – Mar 16 | Apr 20 – May 4 | — | — |
| Peas | — | — | Mar 2 – Mar 23 | Aug 11 – Sep 1 |
| Spinach | — | — | Mar 2 – Mar 23 | Sep 8 – Sep 29 |
| Radishes | — | — | Mar 9 – Apr 20 | Sep 22 – Oct 13 |
| Cucumbers | Mar 16 – Mar 23 | Apr 27 – May 4 | Apr 20 – May 4 | Aug 18 – Sep 1 |
| Zucchini & Summer Squash | Mar 16 – Mar 23 | — | Apr 20 – May 4 | Aug 25 – Sep 8 |
| Winter Squash & Pumpkins | Mar 16 – Mar 23 | — | Apr 20 – May 4 | — |
| Melons & Watermelon | Mar 16 – Mar 23 | Apr 27 – May 11 | — | — |
| Carrots | — | — | Mar 23 – Apr 20 | Aug 11 – Aug 25 |
| Beets | — | — | Mar 23 – Apr 20 | Aug 25 – Sep 8 |
| Potatoes | — | — | Mar 23 – Apr 13 | — |
| Swiss Chard | — | — | Mar 30 – Apr 27 | Aug 25 – Sep 8 |
| Cilantro | — | — | Mar 30 – Apr 20 | Sep 8 – Sep 29 |
| Green Beans | — | — | Apr 20 – May 11 | Aug 18 – Sep 1 |
| Sweet Corn | — | — | Apr 20 – May 4 | — |
| Sweet Potatoes | — | Apr 27 – May 18 | — | — |
| Garlic | — | — | — | Oct 20 – Nov 24 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Alsea Fh (Fall Creek), OR weather station, 13 km away (elevation 230 ft (70 m)).
Frost dates near Tidewater
- Waldport Feb 19 · Dec 11
- Seal Rock Feb 19 · Dec 16
- Yachats Feb 19 · Dec 11
- South Beach Feb 19 · Dec 16
- Toledo Feb 19 · Dec 16
- Alsea Apr 13 · Nov 3
- Eddyville Feb 19 · Dec 16
- Newport Mar 21 · Nov 27
- Deadwood Feb 15 · Dec 9
- Blodgett May 15 · Oct 8
Frequently asked questions
When is the last frost in Tidewater, OR?
The median last spring frost in Tidewater, OR is April 13. There is still about a 10% chance of frost after May 3, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Tidewater, OR?
The median first fall frost is November 3, with about a 10% chance of frost before October 9.
How long is the growing season in Tidewater, OR?
About 204 days between the median last spring frost and first fall frost.
What planting zone is Tidewater, OR?
Tidewater, OR is in USDA hardiness zone 9a.