[quote=sweetheart;913870a) there are no frogs in the pond. I have looked
b) there is no spawn in the pond
c) normal activity at this time of year would give me sight of frogs in the
pond ( the pond is outside the sitting room window so I do have a good view
much of the day
d) I know of a frog ( or more) in the greenhouse down the bottom of the
garden around 300 yards away from the pond. I have disturbed him/ her/ them
(if more than one) two or three times clearing things up there. Done this
several times in the last few weeks.
e) I know of a second frog in the waste land at the bottom of the garden -
maybe the same frog. I would like to hope there are two. They do appear to
be different sizes.

So all in all I am well placed to say my frogs are not in the pond. Maybe
not 24 hour surveillance but close. The sad fact is I have lost my frogs
and its because I didn't take care of them. I didn't get rid of the
predators when I saw them in the first instance. I hope others will take
more care.

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Don't beat yourself up! It may or may not be due to something you have done/nor done. You cannot endlessly protect wild creatures from natural predators. It has been a hard winter and hibernating creatures are sure to have suffered regardless of your actions. In any case, I think it's still a bit early for frogspawn, they'll wait for a better mild spell than we've had so far. I have seen a bit of turbulence in my pond which indicates they are waking up, though.

frogs start to come out of hibernation in febuary and march and start making their way too there breeding grounds so dont worry there is still time for you to get your frogs back
the males will arrive first and then attract the female frogs can spawn as late a april they do in my pond every year
theres alot of factors into what could happen to your frogs though out the year roads around here kill alot of the frogs,heron, magpies i have even seen adult frogs take baby frogs.
it may even be pollution or just they have had their time (old age)

i wouldnt worry to much it still early in the year