Frost dates for 84018Croydon, UT
The average last spring frost in Croydon is May 30 and the average first fall frost is September 18, giving a typical growing season of about 112 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 30
- Average first fall frost
- Sep 18
- Growing season
- 112 days
Safer after Jun 16 (1-in-10 risk)
Possible by Sep 4 (1-in-10 risk)
Last frost typically in 215 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | May 31 · Jun 15 · Jun 30 | Aug 23 · Sep 8 · Sep 22 | 83 days | 100% |
| Frost / freeze (32°F) | May 11 · May 30 · Jun 16 | Sep 4 · Sep 18 · Oct 1 | 112 days | 100% |
| Hard freeze (28°F) | Apr 25 · May 10 · May 31 | Sep 17 · Oct 1 · Oct 14 | 141 days | 100% |
Planting calendar for Croydon
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 29 – Jul 5 |
| Tomatoes | Transplant outdoors | Jun 15 – May 29 |
| Peppers | Start seeds indoors | Apr 29 – May 30 |
| Peppers | Transplant outdoors | Jun 29 – Jul 30 |
| Eggplant | Start seeds indoors | May 16 – Jun 14 |
| Eggplant | Transplant outdoors | Jun 29 – Jul 30 |
| Cucumbers | Sow outdoors | Jun 29 – Jun 8 |
| Summer squash | Sow outdoors | Jun 15 – Jul 30 |
| Winter squash & pumpkins | Sow outdoors | Jun 29 – Jul 30 |
| Snap beans | Sow outdoors | Jun 15 – Jul 1 |
| Sweet corn | Sow outdoors | Jun 15 – May 29 |
| Watermelon & cantaloupe | Sow outdoors | Jun 29 – Jul 30 |
| Okra | Sow outdoors | Jun 22 – Jul 15 |
| Peas | Sow outdoors (spring) | Apr 29 – Jun 14 |
| Potatoes | Plant outdoors (spring) | Apr 29 – Jun 29 |
| Onions | Start seeds indoors (spring) | Mar 18 – Apr 14 |
| Onions | Transplant outdoors (spring) | May 16 – Jun 14 |
| Broccoli | Start seeds indoors (spring) | Apr 11 – May 15 |
| Broccoli | Transplant outdoors (spring) | May 16 – Jun 14 |
| Broccoli | Start seeds indoors (fall) | May 19 – May 29 |
| Broccoli | Transplant outdoors (fall) | Jun 18 – Jun 29 |
| Cabbage | Start seeds indoors (spring) | Apr 1 – Apr 29 |
| Cabbage | Transplant outdoors (spring) | Apr 29 – May 30 |
| Cabbage | Start seeds indoors (fall) | May 9 – Jun 8 |
| Cabbage | Transplant outdoors (fall) | Jun 8 – Jul 9 |
| Leaf lettuce | Sow outdoors (spring) | Apr 29 – Jul 15 |
| Leaf lettuce | Sow outdoors (fall) | Jun 8 – Jul 25 |
| Spinach | Sow outdoors (spring) | Apr 22 – Jun 5 |
| Spinach | Sow outdoors (fall) | Jun 25 – Jul 30 |
| Radishes | Sow outdoors (spring) | Apr 29 – Jun 19 |
| Radishes | Sow outdoors (fall) | Jun 8 – Aug 9 |
| Kale | Sow outdoors (spring) | May 16 – Jun 5 |
| Kale | Sow outdoors (fall) | Jun 1 – Jul 9 |
| Carrots | Sow outdoors (spring) | May 30 – Jul 15 |
| Carrots | Sow outdoors (fall) | May 9 – Jun 24 |
| Garlic | Plant outdoors (fall) | Sep 8 – Oct 9 |
Where these dates come from
ZIP code 84018 is matched to the NOAA station Echo Dam, UT, 13.7 km away, at 5,470 ft elevation (175 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Echo Dam, UT (used) | 5,470 ft | May 30 | Sep 18 |
| Morgan, UT | 5,100 ft | May 25 | Sep 24 |
| Coalville, UT | 5,550 ft | Jun 7 | Sep 12 |
| Huntsville Monastery, UT | 5,140 ft | Jun 4 | Sep 16 |
Frost dates near Croydon
- Henefer, UT 84033 · last May 30, first Sep 18
- Echo, UT 84024 · last May 30, first Sep 18
- Morgan, UT 84050 · last May 25, first Sep 24
- Huntsville, UT 84317 · last May 22, first Sep 26
- Coalville, UT 84017 · last May 29, first Sep 25
- Farmington, UT 84025 · last Apr 19, first Oct 19
- Centerville, UT 84014 · last Apr 24, first Oct 19
- Layton, UT 84040 · last Apr 22, first Oct 22
Frequently asked questions
- When is the last frost in Croydon, UT?
- For ZIP code 84018, the average last spring frost (32°F) is May 30, based on NOAA 1991-2020 climate normals for the Echo Dam, UT weather station. There is a 1-in-10 chance of a frost after June 16.
- When is the first frost in Croydon, UT?
- The average first fall frost (32°F) is September 18. There is a 1-in-10 chance of frost by September 4, so tender plants are at risk from that point on.
- How long is the growing season in 84018?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 112 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.