Frost Dates: First and last frost dates for Scotts Mills, OR
ℹ️ How to read these charts for the spring
As spring unfolds, the risk of frost gradually decreases each day until your tender plants are finally safe. The probabilities shown in the chart help you make smart decisions about when to plant.
While frost typically forms at 32°F, tender plants can be damaged even when temperatures are slightly higher. Air temperatures are often measured several feet above the ground, but temperatures at plant level can be several degrees colder. Protected areas like porches help by blocking radiational cooling. Given these variables, we consider 36°F the "caution zone" for frost-sensitive plants.
Key dates for your spring planting:
- By June 22, you have a 90% chance of being frost-free — this is your "safe date" for planting tender crops
- Around June 6, there's a 50/50 chance of frost — check weather forecasts carefully if planting now
- Before May 26, there's still an 80% risk of frost — too early for tomatoes and other tender plants unless you're prepared to protect them
If the 10-day forecast shows no temperatures below 40°F, you might safely plant earlier than the above dates suggest. Many gardeners watch for this weather window to get a head start on the growing season.
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| Last 16° | Feb 20 | Feb 7 | Jan 27 | Jan 18 | Jan 9 | Dec 29 | Dec 16 | -- | -- |
| Last 20° | Mar 11 | Feb 24 | Feb 13 | Feb 4 | Jan 26 | Jan 16 | Jan 4 | Dec 17 | -- |
| Last 24° | Mar 16 | Mar 6 | Feb 26 | Feb 19 | Feb 13 | Feb 6 | Jan 29 | Jan 19 | -- |
| Last 28° | May 7 | Apr 26 | Apr 19 | Apr 12 | Apr 6 | Mar 30 | Mar 23 | Mar 16 | Mar 5 |
| Last 32° | Jun 1 | May 25 | May 19 | May 15 | May 11 | May 7 | May 2 | Apr 27 | Apr 20 |
| Last 36° | Jun 22 | Jun 16 | Jun 12 | Jun 9 | Jun 6 | Jun 2 | May 30 | May 26 | May 20 |
ℹ️ How to read these charts for the fall
As summer ends in Scotts Mills, OR, nighttime temperatures begin to drop, and your risk of frost increases with each passing day. Knowing when to expect frost helps you harvest sensitive crops and extend your growing season with protection methods.
The chart below shows the probability of experiencing specific temperatures on various dates. Here's what this means for your garden:
These probabilities help you time your end-of-season harvests and know when to apply protective measures like row covers, cloches, or cold frames to extend your harvest.
| Temperature | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| First 16° | Dec 5 | Dec 18 | Dec 28 | Jan 6 | Jan 15 | Jan 26 | Feb 11 | -- | -- |
| First 20° | Nov 17 | Nov 29 | Dec 7 | Dec 15 | Dec 23 | Dec 31 | Jan 10 | Jan 29 | -- |
| First 24° | Nov 10 | Nov 21 | Nov 29 | Dec 6 | Dec 12 | Dec 19 | Dec 27 | Jan 6 | -- |
| First 28° | Oct 21 | Oct 31 | Nov 6 | Nov 12 | Nov 18 | Nov 23 | Nov 29 | Dec 6 | Dec 15 |
| First 32° | Oct 2 | Oct 9 | Oct 14 | Oct 18 | Oct 22 | Oct 26 | Oct 30 | Nov 4 | Nov 10 |
| First 36° | Sep 13 | Sep 19 | Sep 23 | Sep 27 | Oct 1 | Oct 4 | Oct 8 | Oct 12 | Oct 19 |
📍 Frost Dates for other nearby locations
- Silver Creek Falls, OR 9.8 mi
- Silverton, OR 12.3 mi
- Stayton, OR 21.2 mi
- N Willamette, OR 22.0 mi
- Oregon City, OR 24.3 mi
- Estacada, OR 26.6 mi
- Salem Ap Mcnary Fld, OR 28.8 mi
- Detroit Dam, OR 30.6 mi
- Three Lynx, OR 37.3 mi
- Troutdale, OR 40.6 mi
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Data is provided by the NOAA National Centers for Environmental Information.